[PATCH] EDAC: probe1 cleanup 1-of-2

- Add lower-level functions that handle various parts of the initialization
  done by the xxx_probe1() functions.  Some of the xxx_probe1() functions are
  much too long and complicated (see "Chapter 5: Functions" in
  Documentation/CodingStyle).

- Cleanup of probe1() functions in EDAC
Signed-off-by: Doug Thompson <norsk5@xmission.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/edac/amd76x_edac.c

@@ -182,6 +182,38 @@ static void amd76x_check(struct mem_ctl_info *mci)
 	amd76x_process_error_info(mci, &info, 1);
 }
 
+static void amd76x_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
+		enum edac_type edac_mode)
+{
+	struct csrow_info *csrow;
+	u32 mba, mba_base, mba_mask, dms;
+	int index;
+
+	for (index = 0; index < mci->nr_csrows; index++) {
+		csrow = &mci->csrows[index];
+
+		/* find the DRAM Chip Select Base address and mask */
+		pci_read_config_dword(pdev,
+				      AMD76X_MEM_BASE_ADDR + (index * 4),
+				      &mba);
+
+		if (!(mba & BIT(0)))
+			continue;
+
+		mba_base = mba & 0xff800000UL;
+		mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
+		pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
+		csrow->first_page = mba_base >> PAGE_SHIFT;
+		csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
+		csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
+		csrow->page_mask = mba_mask >> PAGE_SHIFT;
+		csrow->grain = csrow->nr_pages << PAGE_SHIFT;
+		csrow->mtype = MEM_RDDR;
+		csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
+		csrow->edac_mode = edac_mode;
+	}
+}
+
 /**
  *	amd76x_probe1	-	Perform set up for detected device
  *	@pdev; PCI device detected
@@ -193,15 +225,13 @@ static void amd76x_check(struct mem_ctl_info *mci)
  */
 static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 {
-	int rc = -ENODEV;
-	int index;
-	struct mem_ctl_info *mci = NULL;
-	enum edac_type ems_modes[] = {
+	static const enum edac_type ems_modes[] = {
 		EDAC_NONE,
 		EDAC_EC,
 		EDAC_SECDED,
 		EDAC_SECDED
 	};
+	struct mem_ctl_info *mci = NULL;
 	u32 ems;
 	u32 ems_mode;
 	struct amd76x_error_info discard;
@@ -212,8 +242,7 @@ static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 	mci = edac_mc_alloc(0, AMD76X_NR_CSROWS, AMD76X_NR_CHANS);
 
 	if (mci == NULL) {
-		rc = -ENOMEM;
-		goto fail;
+		return -ENOMEM;
 	}
 
 	debugf0("%s(): mci = %p\n", __func__, mci);
@@ -228,33 +257,7 @@ static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 	mci->edac_check = amd76x_check;
 	mci->ctl_page_to_phys = NULL;
 
-	for (index = 0; index < mci->nr_csrows; index++) {
-		struct csrow_info *csrow = &mci->csrows[index];
-		u32 mba;
-		u32 mba_base;
-		u32 mba_mask;
-		u32 dms;
-
-		/* find the DRAM Chip Select Base address and mask */
-		pci_read_config_dword(pdev,
-				AMD76X_MEM_BASE_ADDR + (index * 4), &mba);
-
-		if (!(mba & BIT(0)))
-			continue;
-
-		mba_base = mba & 0xff800000UL;
-		mba_mask = ((mba & 0xff80) << 16) | 0x7fffffUL;
-		pci_read_config_dword(pdev, AMD76X_DRAM_MODE_STATUS, &dms);
-		csrow->first_page = mba_base >> PAGE_SHIFT;
-		csrow->nr_pages = (mba_mask + 1) >> PAGE_SHIFT;
-		csrow->last_page = csrow->first_page + csrow->nr_pages - 1;
-		csrow->page_mask = mba_mask >> PAGE_SHIFT;
-		csrow->grain = csrow->nr_pages << PAGE_SHIFT;
-		csrow->mtype = MEM_RDDR;
-		csrow->dtype = ((dms >> index) & 0x1) ? DEV_X4 : DEV_UNKNOWN;
-		csrow->edac_mode = ems_modes[ems_mode];
-	}
-
+	amd76x_init_csrows(mci, pdev, ems_modes[ems_mode]);
 	amd76x_get_error_info(mci, &discard);  /* clear counters */
 
 	/* Here we assume that we will never see multiple instances of this
@@ -270,9 +273,8 @@ static int amd76x_probe1(struct pci_dev *pdev, int dev_idx)
 	return 0;
 
 fail:
-	if (mci != NULL)
 	edac_mc_free(mci);
-	return rc;
+	return -ENODEV;
 }
 
 /* returns count (>= 0), or negative on error */

drivers/edac/e7xxx_edac.c

@@ -335,90 +335,52 @@ static void e7xxx_check(struct mem_ctl_info *mci)
 	e7xxx_process_error_info(mci, &info, 1);
 }
 
-static int e7xxx_probe1(struct pci_dev *pdev, int dev_idx)
+/* Return 1 if dual channel mode is active.  Else return 0. */
+static inline int dual_channel_active(u32 drc, int dev_idx)
 {
-	int rc = -ENODEV;
-	int index;
-	u16 pci_data;
-	struct mem_ctl_info *mci = NULL;
-	struct e7xxx_pvt *pvt = NULL;
-	u32 drc;
-	int drc_chan = 1;	/* Number of channels 0=1chan,1=2chan */
-	int drc_drbg = 1;	/* DRB granularity 0=32mb,1=64mb */
-	int drc_ddim;		/* DRAM Data Integrity Mode 0=none,2=edac */
-	u32 dra;
-	unsigned long last_cumul_size;
-	struct e7xxx_error_info discard;
-
-	debugf0("%s(): mci\n", __func__);
+	return (dev_idx == E7501) ? ((drc >> 22) & 0x1) : 1;
+}
 
-	/* need to find out the number of channels */
-	pci_read_config_dword(pdev, E7XXX_DRC, &drc);
 
+/* Return DRB granularity (0=32mb, 1=64mb). */
+static inline int drb_granularity(u32 drc, int dev_idx)
+{
 	/* only e7501 can be single channel */
-	if (dev_idx == E7501) {
-		drc_chan = ((drc >> 22) & 0x1);
-		drc_drbg = (drc >> 18) & 0x3;
-	}
-
-	drc_ddim = (drc >> 20) & 0x3;
-	mci = edac_mc_alloc(sizeof(*pvt), E7XXX_NR_CSROWS, drc_chan + 1);
-
-	if (mci == NULL) {
-		rc = -ENOMEM;
-		goto fail;
-	}
-
-	debugf3("%s(): init mci\n", __func__);
-	mci->mtype_cap = MEM_FLAG_RDDR;
-	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED |
-			EDAC_FLAG_S4ECD4ED;
-	/* FIXME - what if different memory types are in different csrows? */
-	mci->mod_name = EDAC_MOD_STR;
-	mci->mod_ver = E7XXX_REVISION;
-	mci->dev = &pdev->dev;
-
-	debugf3("%s(): init pvt\n", __func__);
-	pvt = (struct e7xxx_pvt *) mci->pvt_info;
-	pvt->dev_info = &e7xxx_devs[dev_idx];
-	pvt->bridge_ck = pci_get_device(PCI_VENDOR_ID_INTEL,
-					pvt->dev_info->err_dev,
-					pvt->bridge_ck);
+	return (dev_idx == E7501) ? ((drc >> 18) & 0x3) : 1;
+}
 
-	if (!pvt->bridge_ck) {
-		e7xxx_printk(KERN_ERR, "error reporting device not found:"
-			"vendor %x device 0x%x (broken BIOS?)\n",
-			PCI_VENDOR_ID_INTEL, e7xxx_devs[dev_idx].err_dev);
-		goto fail;
-	}
 
-	debugf3("%s(): more mci init\n", __func__);
-	mci->ctl_name = pvt->dev_info->ctl_name;
-	mci->edac_check = e7xxx_check;
-	mci->ctl_page_to_phys = ctl_page_to_phys;
+static void e7xxx_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
+		int dev_idx, u32 drc)
+{
+	unsigned long last_cumul_size;
+	int index;
+	u8 value;
+	u32 dra, cumul_size;
+	int drc_chan, drc_drbg, drc_ddim, mem_dev;
+	struct csrow_info *csrow;
 
-	/* find out the device types */
 	pci_read_config_dword(pdev, E7XXX_DRA, &dra);
+	drc_chan = dual_channel_active(drc, dev_idx);
+	drc_drbg = drb_granularity(drc, dev_idx);
+	drc_ddim = (drc >> 20) & 0x3;
+	last_cumul_size = 0;
 
-	/*
-	 * The dram row boundary (DRB) reg values are boundary address
+	/* The dram row boundary (DRB) reg values are boundary address
 	 * for each DRAM row with a granularity of 32 or 64MB (single/dual
 	 * channel operation).  DRB regs are cumulative; therefore DRB7 will
 	 * contain the total memory contained in all eight rows.
 	 */
-	for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
-		u8 value;
-		u32 cumul_size;
+	for (index = 0; index < mci->nr_csrows; index++) {
 		/* mem_dev 0=x8, 1=x4 */
-		int mem_dev = (dra >> (index * 4 + 3)) & 0x1;
-		struct csrow_info *csrow = &mci->csrows[index];
+		mem_dev = (dra >> (index * 4 + 3)) & 0x1;
+		csrow = &mci->csrows[index];
 
 		pci_read_config_byte(pdev, E7XXX_DRB + index, &value);
 		/* convert a 64 or 32 MiB DRB to a page size. */
 		cumul_size = value << (25 + drc_drbg - PAGE_SHIFT);
 		debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 			cumul_size);
-
 		if (cumul_size == last_cumul_size)
 			continue;	/* not populated */
 
@@ -445,9 +407,54 @@ static int e7xxx_probe1(struct pci_dev *pdev, int dev_idx)
 		} else
 			csrow->edac_mode = EDAC_NONE;
 	}
+}
 
-	mci->edac_cap |= EDAC_FLAG_NONE;
+static int e7xxx_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	u16 pci_data;
+	struct mem_ctl_info *mci = NULL;
+	struct e7xxx_pvt *pvt = NULL;
+	u32 drc;
+	int drc_chan;
+	struct e7xxx_error_info discard;
+
+	debugf0("%s(): mci\n", __func__);
+	pci_read_config_dword(pdev, E7XXX_DRC, &drc);
+
+	drc_chan = dual_channel_active(drc, dev_idx);
+	mci = edac_mc_alloc(sizeof(*pvt), E7XXX_NR_CSROWS, drc_chan + 1);
+
+	if (mci == NULL)
+		return -ENOMEM;
+
+	debugf3("%s(): init mci\n", __func__);
+	mci->mtype_cap = MEM_FLAG_RDDR;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED |
+			EDAC_FLAG_S4ECD4ED;
+	/* FIXME - what if different memory types are in different csrows? */
+	mci->mod_name = EDAC_MOD_STR;
+	mci->mod_ver = E7XXX_REVISION;
+	mci->dev = &pdev->dev;
+	debugf3("%s(): init pvt\n", __func__);
+	pvt = (struct e7xxx_pvt *) mci->pvt_info;
+	pvt->dev_info = &e7xxx_devs[dev_idx];
+	pvt->bridge_ck = pci_get_device(PCI_VENDOR_ID_INTEL,
+					pvt->dev_info->err_dev,
+					pvt->bridge_ck);
+
+	if (!pvt->bridge_ck) {
+		e7xxx_printk(KERN_ERR, "error reporting device not found:"
+			"vendor %x device 0x%x (broken BIOS?)\n",
+			PCI_VENDOR_ID_INTEL, e7xxx_devs[dev_idx].err_dev);
+		goto fail0;
+	}
 
+	debugf3("%s(): more mci init\n", __func__);
+	mci->ctl_name = pvt->dev_info->ctl_name;
+	mci->edac_check = e7xxx_check;
+	mci->ctl_page_to_phys = ctl_page_to_phys;
+	e7xxx_init_csrows(mci, pdev, dev_idx, drc);
+	mci->edac_cap |= EDAC_FLAG_NONE;
 	debugf3("%s(): tolm, remapbase, remaplimit\n", __func__);
 	/* load the top of low memory, remap base, and remap limit vars */
 	pci_read_config_word(pdev, E7XXX_TOLM, &pci_data);
@@ -468,21 +475,20 @@ static int e7xxx_probe1(struct pci_dev *pdev, int dev_idx)
 	 */
 	if (edac_mc_add_mc(mci,0)) {
 		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
-		goto fail;
+		goto fail1;
 	}
 
 	/* get this far and it's successful */
 	debugf3("%s(): success\n", __func__);
 	return 0;
 
-fail:
-	if (mci != NULL) {
-		if(pvt != NULL && pvt->bridge_ck)
+fail1:
 	pci_dev_put(pvt->bridge_ck);
+
+fail0:
 	edac_mc_free(mci);
-	}
 
-	return rc;
+	return -ENODEV;
 }
 
 /* returns count (>= 0), or negative on error */

drivers/edac/i82860_edac.c

@@ -133,61 +133,27 @@ static void i82860_check(struct mem_ctl_info *mci)
 	i82860_process_error_info(mci, &info, 1);
 }
 
-static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
+static void i82860_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev)
 {
-	int rc = -ENODEV;
-	int index;
-	struct mem_ctl_info *mci = NULL;
 	unsigned long last_cumul_size;
-	struct i82860_error_info discard;
-
-	u16 mchcfg_ddim;	/* DRAM Data Integrity Mode 0=none,2=edac */
-
-	/* RDRAM has channels but these don't map onto the abstractions that
-	   edac uses.
-	   The device groups from the GRA registers seem to map reasonably
-	   well onto the notion of a chip select row.
-	   There are 16 GRA registers and since the name is associated with
-	   the channel and the GRA registers map to physical devices so we are
-	   going to make 1 channel for group.
-	 */
-	mci = edac_mc_alloc(0, 16, 1);
-
-	if (!mci)
-		return -ENOMEM;
-
-	debugf3("%s(): init mci\n", __func__);
-	mci->dev = &pdev->dev;
-	mci->mtype_cap = MEM_FLAG_DDR;
-
-	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
-	/* I"m not sure about this but I think that all RDRAM is SECDED */
-	mci->edac_cap = EDAC_FLAG_SECDED;
-	/* adjust FLAGS */
-
-	mci->mod_name = EDAC_MOD_STR;
-	mci->mod_ver = I82860_REVISION;
-	mci->ctl_name = i82860_devs[dev_idx].ctl_name;
-	mci->edac_check = i82860_check;
-	mci->ctl_page_to_phys = NULL;
+	u16 mchcfg_ddim;  /* DRAM Data Integrity Mode 0=none, 2=edac */
+	u16 value;
+	u32 cumul_size;
+	struct csrow_info *csrow;
+	int index;
 
 	pci_read_config_word(pdev, I82860_MCHCFG, &mchcfg_ddim);
 	mchcfg_ddim = mchcfg_ddim & 0x180;
+	last_cumul_size = 0;
 
-	/*
-	 * The group row boundary (GRA) reg values are boundary address
+	/* The group row boundary (GRA) reg values are boundary address
 	 * for each DRAM row with a granularity of 16MB.  GRA regs are
 	 * cumulative; therefore GRA15 will contain the total memory contained
 	 * in all eight rows.
 	 */
-	for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
-		u16 value;
-		u32 cumul_size;
-		struct csrow_info *csrow = &mci->csrows[index];
-
-		pci_read_config_word(pdev, I82860_GBA + index * 2,
-				&value);
-
+	for (index = 0; index < mci->nr_csrows; index++) {
+		csrow = &mci->csrows[index];
+		pci_read_config_word(pdev, I82860_GBA + index * 2, &value);
 		cumul_size = (value & I82860_GBA_MASK) <<
 		    (I82860_GBA_SHIFT - PAGE_SHIFT);
 		debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
@@ -205,7 +171,38 @@ static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
 		csrow->dtype = DEV_UNKNOWN;
 		csrow->edac_mode = mchcfg_ddim ? EDAC_SECDED : EDAC_NONE;
 	}
+}
+
+static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	struct mem_ctl_info *mci;
+	struct i82860_error_info discard;
+
+	/* RDRAM has channels but these don't map onto the abstractions that
+	   edac uses.
+	   The device groups from the GRA registers seem to map reasonably
+	   well onto the notion of a chip select row.
+	   There are 16 GRA registers and since the name is associated with
+	   the channel and the GRA registers map to physical devices so we are
+	   going to make 1 channel for group.
+	 */
+	mci = edac_mc_alloc(0, 16, 1);
+
+	if (!mci)
+		return -ENOMEM;
 
+	debugf3("%s(): init mci\n", __func__);
+	mci->dev = &pdev->dev;
+	mci->mtype_cap = MEM_FLAG_DDR;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	/* I"m not sure about this but I think that all RDRAM is SECDED */
+	mci->edac_cap = EDAC_FLAG_SECDED;
+	mci->mod_name = EDAC_MOD_STR;
+	mci->mod_ver = I82860_REVISION;
+	mci->ctl_name = i82860_devs[dev_idx].ctl_name;
+	mci->edac_check = i82860_check;
+	mci->ctl_page_to_phys = NULL;
+	i82860_init_csrows(mci, pdev);
 	i82860_get_error_info(mci, &discard);  /* clear counters */
 
 	/* Here we assume that we will never see multiple instances of this
@@ -213,14 +210,17 @@ static int i82860_probe1(struct pci_dev *pdev, int dev_idx)
 	 */
 	if (edac_mc_add_mc(mci,0)) {
 		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
-		edac_mc_free(mci);
-	} else {
+		goto fail;
+	}
+
 	/* get this far and it's successful */
 	debugf3("%s(): success\n", __func__);
-		rc = 0;
-	}
 
-	return rc;
+	return 0;
+
+fail:
+	edac_mc_free(mci);
+	return -ENODEV;
 }
 
 /* returns count (>= 0), or negative on error */

drivers/edac/i82875p_edac.c

@@ -265,116 +265,109 @@ static void i82875p_check(struct mem_ctl_info *mci)
 extern int pci_proc_attach_device(struct pci_dev *);
 #endif
 
-static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
+/* Return 0 on success or 1 on failure. */
+static int i82875p_setup_overfl_dev(struct pci_dev *pdev,
+		struct pci_dev **ovrfl_pdev, void __iomem **ovrfl_window)
 {
-	int rc = -ENODEV;
-	int index;
-	struct mem_ctl_info *mci = NULL;
-	struct i82875p_pvt *pvt = NULL;
-	unsigned long last_cumul_size;
-	struct pci_dev *ovrfl_pdev;
-	void __iomem *ovrfl_window = NULL;
-	u32 drc;
-	u32 drc_chan;		/* Number of channels 0=1chan,1=2chan */
-	u32 nr_chans;
-	u32 drc_ddim;		/* DRAM Data Integrity Mode 0=none,2=edac */
-	struct i82875p_error_info discard;
+	struct pci_dev *dev;
+	void __iomem *window;
 
-	debugf0("%s()\n", __func__);
-	ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
+	*ovrfl_pdev = NULL;
+	*ovrfl_window = NULL;
+	dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
 
-	if (!ovrfl_pdev) {
-		/*
-		 * Intel tells BIOS developers to hide device 6 which
+	if (dev == NULL) {
+		/* Intel tells BIOS developers to hide device 6 which
 		 * configures the overflow device access containing
 		 * the DRBs - this is where we expose device 6.
 		 * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm
 		 */
 		pci_write_bits8(pdev, 0xf4, 0x2, 0x2);
-		ovrfl_pdev =
-			pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0));
+		dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0));
 
-		if (!ovrfl_pdev)
-			return -ENODEV;
+		if (dev == NULL)
+			return 1;
 	}
 
+	*ovrfl_pdev = dev;
+
 #ifdef CONFIG_PROC_FS
-	if (!ovrfl_pdev->procent && pci_proc_attach_device(ovrfl_pdev)) {
-		i82875p_printk(KERN_ERR,
-			"%s(): Failed to attach overflow device\n", __func__);
-		return -ENODEV;
+	if ((dev->procent == NULL) && pci_proc_attach_device(dev)) {
+		i82875p_printk(KERN_ERR, "%s(): Failed to attach overflow "
+			       "device\n", __func__);
+		return 1;
 	}
-#endif
-				/* CONFIG_PROC_FS */
-	if (pci_enable_device(ovrfl_pdev)) {
-		i82875p_printk(KERN_ERR,
-			"%s(): Failed to enable overflow device\n", __func__);
-		return -ENODEV;
+#endif  /* CONFIG_PROC_FS */
+	if (pci_enable_device(dev)) {
+		i82875p_printk(KERN_ERR, "%s(): Failed to enable overflow "
+			       "device\n", __func__);
+		return 1;
 	}
 
-	if (pci_request_regions(ovrfl_pdev, pci_name(ovrfl_pdev))) {
+	if (pci_request_regions(dev, pci_name(dev))) {
 #ifdef CORRECT_BIOS
 		goto fail0;
 #endif
 	}
 
 	/* cache is irrelevant for PCI bus reads/writes */
-	ovrfl_window = ioremap_nocache(pci_resource_start(ovrfl_pdev, 0),
-				pci_resource_len(ovrfl_pdev, 0));
+	window = ioremap_nocache(pci_resource_start(dev, 0),
+				 pci_resource_len(dev, 0));
 
-	if (!ovrfl_window) {
+	if (window == NULL) {
 		i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n",
 			       __func__);
 		goto fail1;
 	}
 
-	/* need to find out the number of channels */
-	drc = readl(ovrfl_window + I82875P_DRC);
-	drc_chan = ((drc >> 21) & 0x1);
-	nr_chans = drc_chan + 1;
+	*ovrfl_window = window;
+	return 0;
 
-	drc_ddim = (drc >> 18) & 0x1;
-	mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans),
-				nr_chans);
+fail1:
+	pci_release_regions(dev);
 
-	if (!mci) {
-		rc = -ENOMEM;
-		goto fail2;
-	}
+#ifdef CORRECT_BIOS
+fail0:
+	pci_disable_device(dev);
+#endif
+	/* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
+	return 1;
+}
 
-	debugf3("%s(): init mci\n", __func__);
-	mci->dev = &pdev->dev;
-	mci->mtype_cap = MEM_FLAG_DDR;
-	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
-	mci->edac_cap = EDAC_FLAG_UNKNOWN;
-	/* adjust FLAGS */
 
-	mci->mod_name = EDAC_MOD_STR;
-	mci->mod_ver = I82875P_REVISION;
-	mci->ctl_name = i82875p_devs[dev_idx].ctl_name;
-	mci->edac_check = i82875p_check;
-	mci->ctl_page_to_phys = NULL;
-	debugf3("%s(): init pvt\n", __func__);
-	pvt = (struct i82875p_pvt *) mci->pvt_info;
-	pvt->ovrfl_pdev = ovrfl_pdev;
-	pvt->ovrfl_window = ovrfl_window;
+/* Return 1 if dual channel mode is active.  Else return 0. */
+static inline int dual_channel_active(u32 drc)
+{
+	return (drc >> 21) & 0x1;
+}
 
-	/*
-	 * The dram row boundary (DRB) reg values are boundary address
+
+static void i82875p_init_csrows(struct mem_ctl_info *mci,
+		struct pci_dev *pdev, void __iomem *ovrfl_window, u32 drc)
+{
+	struct csrow_info *csrow;
+	unsigned long last_cumul_size;
+	u8 value;
+	u32 drc_ddim;  /* DRAM Data Integrity Mode 0=none,2=edac */
+	u32 cumul_size;
+	int index;
+
+	drc_ddim = (drc >> 18) & 0x1;
+	last_cumul_size = 0;
+
+	/* The dram row boundary (DRB) reg values are boundary address
 	 * for each DRAM row with a granularity of 32 or 64MB (single/dual
 	 * channel operation).  DRB regs are cumulative; therefore DRB7 will
 	 * contain the total memory contained in all eight rows.
 	 */
-	for (last_cumul_size = index = 0; index < mci->nr_csrows; index++) {
-		u8 value;
-		u32 cumul_size;
-		struct csrow_info *csrow = &mci->csrows[index];
+
+	for (index = 0; index < mci->nr_csrows; index++) {
+		csrow = &mci->csrows[index];
 
 		value = readb(ovrfl_window + I82875P_DRB + index);
 		cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT);
 		debugf3("%s(): (%d) cumul_size 0x%x\n", __func__, index,
 			cumul_size);
-
 		if (cumul_size == last_cumul_size)
 			continue;	/* not populated */
 
@@ -387,7 +380,49 @@ static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
 		csrow->dtype = DEV_UNKNOWN;
 		csrow->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE;
 	}
+}
+
+static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	int rc = -ENODEV;
+	struct mem_ctl_info *mci;
+	struct i82875p_pvt *pvt;
+	struct pci_dev *ovrfl_pdev;
+	void __iomem *ovrfl_window;
+	u32 drc;
+	u32 nr_chans;
+	struct i82875p_error_info discard;
+
+	debugf0("%s()\n", __func__);
+	ovrfl_pdev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
+
+	if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window))
+		return -ENODEV;
+	drc = readl(ovrfl_window + I82875P_DRC);
+	nr_chans = dual_channel_active(drc) + 1;
+	mci = edac_mc_alloc(sizeof(*pvt), I82875P_NR_CSROWS(nr_chans),
+				nr_chans);
+
+	if (!mci) {
+		rc = -ENOMEM;
+		goto fail0;
+	}
 
+	debugf3("%s(): init mci\n", __func__);
+	mci->dev = &pdev->dev;
+	mci->mtype_cap = MEM_FLAG_DDR;
+	mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
+	mci->edac_cap = EDAC_FLAG_UNKNOWN;
+	mci->mod_name = EDAC_MOD_STR;
+	mci->mod_ver = I82875P_REVISION;
+	mci->ctl_name = i82875p_devs[dev_idx].ctl_name;
+	mci->edac_check = i82875p_check;
+	mci->ctl_page_to_phys = NULL;
+	debugf3("%s(): init pvt\n", __func__);
+	pvt = (struct i82875p_pvt *) mci->pvt_info;
+	pvt->ovrfl_pdev = ovrfl_pdev;
+	pvt->ovrfl_window = ovrfl_window;
+	i82875p_init_csrows(mci, pdev, ovrfl_window, drc);
 	i82875p_get_error_info(mci, &discard);  /* clear counters */
 
 	/* Here we assume that we will never see multiple instances of this
@@ -395,25 +430,20 @@ static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
 	 */
 	if (edac_mc_add_mc(mci,0)) {
 		debugf3("%s(): failed edac_mc_add_mc()\n", __func__);
-		goto fail3;
+		goto fail1;
 	}
 
 	/* get this far and it's successful */
 	debugf3("%s(): success\n", __func__);
 	return 0;
 
-fail3:
+fail1:
 	edac_mc_free(mci);
 
-fail2:
+fail0:
 	iounmap(ovrfl_window);
-
-fail1:
 	pci_release_regions(ovrfl_pdev);
 
-#ifdef CORRECT_BIOS
-fail0:
-#endif
 	pci_disable_device(ovrfl_pdev);
 	/* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
 	return rc;

drivers/edac/r82600_edac.c

@@ -205,25 +205,72 @@ static void r82600_check(struct mem_ctl_info *mci)
 	r82600_process_error_info(mci, &info, 1);
 }
 
-static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
+static inline int ecc_enabled(u8 dramcr)
 {
-	int rc = -ENODEV;
+	return dramcr & BIT(5);
+}
+
+static void r82600_init_csrows(struct mem_ctl_info *mci, struct pci_dev *pdev,
+		u8 dramcr)
+{
+	struct csrow_info *csrow;
 	int index;
-	struct mem_ctl_info *mci = NULL;
+	u8 drbar;  /* SDRAM Row Boundry Address Register */
+	u32 row_high_limit, row_high_limit_last;
+	u32 reg_sdram, ecc_on, row_base;
+
+	ecc_on = ecc_enabled(dramcr);
+	reg_sdram = dramcr & BIT(4);
+	row_high_limit_last = 0;
+
+	for (index = 0; index < mci->nr_csrows; index++) {
+		csrow = &mci->csrows[index];
+
+		/* find the DRAM Chip Select Base address and mask */
+		pci_read_config_byte(pdev, R82600_DRBA + index, &drbar);
+
+		debugf1("%s() Row=%d DRBA = %#0x\n", __func__, index, drbar);
+
+		row_high_limit = ((u32) drbar << 24);
+/*		row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
+
+		debugf1("%s() Row=%d, Boundry Address=%#0x, Last = %#0x\n",
+			__func__, index, row_high_limit, row_high_limit_last);
+
+		/* Empty row [p.57] */
+		if (row_high_limit == row_high_limit_last)
+			continue;
+
+		row_base = row_high_limit_last;
+
+		csrow->first_page = row_base >> PAGE_SHIFT;
+		csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
+		csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
+		/* Error address is top 19 bits - so granularity is      *
+		 * 14 bits                                               */
+		csrow->grain = 1 << 14;
+		csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
+		/* FIXME - check that this is unknowable with this chipset */
+		csrow->dtype = DEV_UNKNOWN;
+
+		/* Mode is global on 82600 */
+		csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
+		row_high_limit_last = row_high_limit;
+	}
+}
+
+static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	struct mem_ctl_info *mci;
 	u8 dramcr;
-	u32 ecc_on;
-	u32 reg_sdram;
 	u32 eapr;
 	u32 scrub_disabled;
 	u32 sdram_refresh_rate;
-	u32 row_high_limit_last = 0;
 	struct r82600_error_info discard;
 
 	debugf0("%s()\n", __func__);
 	pci_read_config_byte(pdev, R82600_DRAMC, &dramcr);
 	pci_read_config_dword(pdev, R82600_EAP, &eapr);
-	ecc_on = dramcr & BIT(5);
-	reg_sdram = dramcr & BIT(4);
 	scrub_disabled = eapr & BIT(31);
 	sdram_refresh_rate = dramcr & (BIT(0) | BIT(1));
 	debugf2("%s(): sdram refresh rate = %#0x\n", __func__,
@@ -231,10 +278,8 @@ static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 	debugf2("%s(): DRAMC register = %#0x\n", __func__, dramcr);
 	mci = edac_mc_alloc(0, R82600_NR_CSROWS, R82600_NR_CHANS);
 
-	if (mci == NULL) {
-		rc = -ENOMEM;
-		goto fail;
-	}
+	if (mci == NULL)
+		return -ENOMEM;
 
 	debugf0("%s(): mci = %p\n", __func__, mci);
 	mci->dev = &pdev->dev;
@@ -250,7 +295,7 @@ static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 	 * is possible.                                               */
 	mci->edac_cap = EDAC_FLAG_NONE | EDAC_FLAG_EC | EDAC_FLAG_SECDED;
 
-	if (ecc_on) {
+	if (ecc_enabled(dramcr)) {
 		if (scrub_disabled)
 			debugf3("%s(): mci = %p - Scrubbing disabled! EAP: "
 				"%#0x\n", __func__, mci, eapr);
@@ -262,46 +307,7 @@ static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 	mci->ctl_name = "R82600";
 	mci->edac_check = r82600_check;
 	mci->ctl_page_to_phys = NULL;
-
-	for (index = 0; index < mci->nr_csrows; index++) {
-		struct csrow_info *csrow = &mci->csrows[index];
-		u8 drbar;	/* sDram Row Boundry Address Register */
-		u32 row_high_limit;
-		u32 row_base;
-
-		/* find the DRAM Chip Select Base address and mask */
-		pci_read_config_byte(pdev, R82600_DRBA + index, &drbar);
-
-		debugf1("MC%d: %s() Row=%d DRBA = %#0x\n", mci->mc_idx,
-			__func__, index, drbar);
-
-		row_high_limit = ((u32) drbar << 24);
-/*		row_high_limit = ((u32)drbar << 24) | 0xffffffUL; */
-
-		debugf1("MC%d: %s() Row=%d, Boundry Address=%#0x, Last = "
-			"%#0x \n", mci->mc_idx, __func__, index,
-			row_high_limit, row_high_limit_last);
-
-		/* Empty row [p.57] */
-		if (row_high_limit == row_high_limit_last)
-			continue;
-
-		row_base = row_high_limit_last;
-		csrow->first_page = row_base >> PAGE_SHIFT;
-		csrow->last_page = (row_high_limit >> PAGE_SHIFT) - 1;
-		csrow->nr_pages = csrow->last_page - csrow->first_page + 1;
-		/* Error address is top 19 bits - so granularity is      *
-		 * 14 bits                                               */
-		csrow->grain = 1 << 14;
-		csrow->mtype = reg_sdram ? MEM_RDDR : MEM_DDR;
-		/* FIXME - check that this is unknowable with this chipset */
-		csrow->dtype = DEV_UNKNOWN;
-
-		/* Mode is global on 82600 */
-		csrow->edac_mode = ecc_on ? EDAC_SECDED : EDAC_NONE;
-		row_high_limit_last = row_high_limit;
-	}
-
+	r82600_init_csrows(mci, pdev, dramcr);
 	r82600_get_error_info(mci, &discard);  /* clear counters */
 
 	/* Here we assume that we will never see multiple instances of this
@@ -324,10 +330,8 @@ static int r82600_probe1(struct pci_dev *pdev, int dev_idx)
 	return 0;
 
 fail:
-	if (mci)
 	edac_mc_free(mci);
-
-	return rc;
+	return -ENODEV;
 }
 
 /* returns count (>= 0), or negative on error */