platform/x86: intel/pmc: Remove unused param idx from pmc_for_each_mode()

pmc_for_each_mode() takes i (index) variable name as a parameter but
the loop index is not used by any of the callers. Make the index
variable internal to pmc_for_each_mode().

This also changes the loop logic such that ->lpm_en_modes[] is never
read beyond num_lpm_modes.
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240806083047.1562-1-ilpo.jarvinen@linux.intel.comReviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

drivers/platform/x86/intel/pmc/core.c

@@ -728,12 +728,11 @@ static int pmc_core_substate_res_show(struct seq_file *s, void *unused)
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
 	const int lpm_adj_x2 = pmc->map->lpm_res_counter_step_x2;
 	u32 offset = pmc->map->lpm_residency_offset;
-	unsigned int i;
 	int mode;
 
 	seq_printf(s, "%-10s %-15s\n", "Substate", "Residency");
 
-	pmc_for_each_mode(i, mode, pmcdev) {
+	pmc_for_each_mode(mode, pmcdev) {
 		seq_printf(s, "%-10s %-15llu\n", pmc_lpm_modes[mode],
 			   adjust_lpm_residency(pmc, offset + (4 * mode), lpm_adj_x2));
 	}
@@ -787,11 +786,10 @@ DEFINE_SHOW_ATTRIBUTE(pmc_core_substate_l_sts_regs);
 static void pmc_core_substate_req_header_show(struct seq_file *s, int pmc_index)
 {
 	struct pmc_dev *pmcdev = s->private;
-	unsigned int i;
 	int mode;
 
 	seq_printf(s, "%30s |", "Element");
-	pmc_for_each_mode(i, mode, pmcdev)
+	pmc_for_each_mode(mode, pmcdev)
 		seq_printf(s, " %9s |", pmc_lpm_modes[mode]);
 
 	seq_printf(s, " %9s |", "Status");
@@ -837,14 +835,14 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 			u32 lpm_status;
 			u32 lpm_status_live;
 			const struct pmc_bit_map *map;
-			int mode, idx, i, len = 32;
+			int mode, i, len = 32;
 
 			/*
 			 * Capture the requirements and create a mask so that we only
 			 * show an element if it's required for at least one of the
 			 * enabled low power modes
 			 */
-			pmc_for_each_mode(idx, mode, pmcdev)
+			pmc_for_each_mode(mode, pmcdev)
 				req_mask |= lpm_req_regs[mp + (mode * num_maps)];
 
 			/* Get the last latched status for this map */
@@ -870,7 +868,7 @@ static int pmc_core_substate_req_regs_show(struct seq_file *s, void *unused)
 				seq_printf(s, "pmc%d: %26s |", pmc_index, map[i].name);
 
 				/* Loop over the enabled states and display if required */
-				pmc_for_each_mode(idx, mode, pmcdev) {
+				pmc_for_each_mode(mode, pmcdev) {
 					bool required = lpm_req_regs[mp + (mode * num_maps)] &
 							bit_mask;
 					seq_printf(s, " %9s |", required ? "Required" : " ");
@@ -935,7 +933,6 @@ static int pmc_core_lpm_latch_mode_show(struct seq_file *s, void *unused)
 {
 	struct pmc_dev *pmcdev = s->private;
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
-	unsigned int idx;
 	bool c10;
 	u32 reg;
 	int mode;
@@ -949,7 +946,7 @@ static int pmc_core_lpm_latch_mode_show(struct seq_file *s, void *unused)
 		c10 = true;
 	}
 
-	pmc_for_each_mode(idx, mode, pmcdev) {
+	pmc_for_each_mode(mode, pmcdev) {
 		if ((BIT(mode) & reg) && !c10)
 			seq_printf(s, " [%s]", pmc_lpm_modes[mode]);
 		else
@@ -970,7 +967,6 @@ static ssize_t pmc_core_lpm_latch_mode_write(struct file *file,
 	struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
 	bool clear = false, c10 = false;
 	unsigned char buf[8];
-	unsigned int idx;
 	int m, mode;
 	u32 reg;
 
@@ -989,7 +985,7 @@ static ssize_t pmc_core_lpm_latch_mode_write(struct file *file,
 	mode = sysfs_match_string(pmc_lpm_modes, buf);
 
 	/* Check string matches enabled mode */
-	pmc_for_each_mode(idx, m, pmcdev)
+	pmc_for_each_mode(m, pmcdev)
 		if (mode == m)
 			break;
 

drivers/platform/x86/intel/pmc/core.h

@@ -604,10 +604,12 @@ int lnl_core_init(struct pmc_dev *pmcdev);
 void cnl_suspend(struct pmc_dev *pmcdev);
 int cnl_resume(struct pmc_dev *pmcdev);
 
-#define pmc_for_each_mode(i, mode, pmcdev)		\
-	for (i = 0, mode = pmcdev->lpm_en_modes[i];	\
-	     i < pmcdev->num_lpm_modes;			\
-	     i++, mode = pmcdev->lpm_en_modes[i])
+#define pmc_for_each_mode(mode, pmcdev)						\
+	for (unsigned int __i = 0, __cond;					\
+	     __cond = __i < (pmcdev)->num_lpm_modes,				\
+	     __cond && ((mode) = (pmcdev)->lpm_en_modes[__i]),			\
+	     __cond;								\
+	     __i++)
 
 #define DEFINE_PMC_CORE_ATTR_WRITE(__name)				\
 static int __name ## _open(struct inode *inode, struct file *file)	\

drivers/platform/x86/intel/pmc/core_ssram.c

@@ -45,7 +45,7 @@ static int pmc_core_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc)
 	struct telem_endpoint *ep;
 	const u8 *lpm_indices;
 	int num_maps, mode_offset = 0;
-	int ret, mode, i;
+	int ret, mode;
 	int lpm_size;
 	u32 guid;
 
@@ -116,7 +116,7 @@ static int pmc_core_get_lpm_req(struct pmc_dev *pmcdev, struct pmc *pmc)
 	 *
 	 */
 	mode_offset = LPM_HEADER_OFFSET + LPM_MODE_OFFSET;
-	pmc_for_each_mode(i, mode, pmcdev) {
+	pmc_for_each_mode(mode, pmcdev) {
 		u32 *req_offset = pmc->lpm_req_regs + (mode * num_maps);
 		int m;