crypto: qat - use pci_wait_for_pending_transaction()

Prior to resetting the hardware, use pci_wait_for_pending_transaction()
instead of open coding similar functionality.
Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Acked-by: Tadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/adf_aer.c

@@ -82,28 +82,15 @@ struct adf_reset_dev_data {
 	struct work_struct reset_work;
 };
 
-#define PPDSTAT_OFFSET 0x7E
 static void adf_dev_restore(struct adf_accel_dev *accel_dev)
 {
 	struct pci_dev *pdev = accel_to_pci_dev(accel_dev);
 	struct pci_dev *parent = pdev->bus->self;
-	uint16_t ppdstat = 0, bridge_ctl = 0;
-	int pending = 0;
+	uint16_t bridge_ctl = 0;
 
 	pr_info("QAT: Resetting device qat_dev%d\n", accel_dev->accel_id);
-	pci_read_config_word(pdev, PPDSTAT_OFFSET, &ppdstat);
-	pending = ppdstat & PCI_EXP_DEVSTA_TRPND;
-	if (pending) {
-		int ctr = 0;
-
-		do {
-			msleep(100);
-			pci_read_config_word(pdev, PPDSTAT_OFFSET, &ppdstat);
-			pending = ppdstat & PCI_EXP_DEVSTA_TRPND;
-		} while (pending && ctr++ < 10);
-	}
 
-	if (pending)
+	if (!pci_wait_for_pending_transaction(pdev))
 		pr_info("QAT: Transaction still in progress. Proceeding\n");
 
 	pci_read_config_word(parent, PCI_BRIDGE_CONTROL, &bridge_ctl);