PCI/DPC: Remove unnecessary RP PIO register structs

We read and immediately print the RP PIO log registers.  We don't save
them, so there's no need to define structs for them.  Remove the structs
and read the registers into local variables instead.  No functional change
intended.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Sinan Kaya <okaya@codeaurora.org>

drivers/pci/pcie/pcie-dpc.c

@@ -17,26 +17,6 @@
 #include "../pci.h"
 #include "aer/aerdrv.h"
 
-struct rp_pio_header_log_regs {
-	u32 dw0;
-	u32 dw1;
-	u32 dw2;
-	u32 dw3;
-};
-
-struct dpc_rp_pio_regs {
-	u32 status;
-	u32 mask;
-	u32 severity;
-	u32 syserror;
-	u32 exception;
-
-	struct rp_pio_header_log_regs header_log;
-	u32 impspec_log;
-	u32 tlp_prefix_log[4];
-	u16 first_error;
-};
-
 struct dpc_dev {
 	struct pcie_device	*dev;
 	struct work_struct	work;
@@ -142,78 +122,66 @@ static void dpc_work(struct work_struct *work)
 			      ctl | PCI_EXP_DPC_CTL_INT_EN);
 }
 
-static void dpc_rp_pio_get_info(struct dpc_dev *dpc,
-				struct dpc_rp_pio_regs *rp_pio)
+static void dpc_rp_pio_get_info(struct dpc_dev *dpc)
 {
 	struct device *dev = &dpc->dev->device;
 	struct pci_dev *pdev = dpc->dev->port;
+	u16 cap = dpc->cap_pos, dpc_status, first_error;
+	u32 status, mask, sev, syserr, exc, dw0, dw1, dw2, dw3, log, prefix;
 	int i;
-	u16 cap = dpc->cap_pos, dpc_status;
-	u32 status;
 
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS,
-			      &rp_pio->status);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_MASK,
-			      &rp_pio->mask);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_STATUS, &status);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_MASK, &mask);
 	dev_err(dev, "rp_pio_status: %#010x, rp_pio_mask: %#010x\n",
-		rp_pio->status, rp_pio->mask);
+		status, mask);
 
-	dpc->rp_pio_status = rp_pio->status;
+	dpc->rp_pio_status = status;
 
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SEVERITY,
-			      &rp_pio->severity);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SYSERROR,
-			      &rp_pio->syserror);
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_EXCEPTION,
-			      &rp_pio->exception);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SEVERITY, &sev);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_SYSERROR, &syserr);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_EXCEPTION, &exc);
 	dev_err(dev, "RP PIO severity=%#010x, syserror=%#010x, exception=%#010x\n",
-		rp_pio->severity, rp_pio->syserror, rp_pio->exception);
+		sev, syserr, exc);
 
 	/* Get First Error Pointer */
 	pci_read_config_word(pdev, cap + PCI_EXP_DPC_STATUS, &dpc_status);
-	rp_pio->first_error = (dpc_status & 0x1f00) >> 8;
+	first_error = (dpc_status & 0x1f00) >> 8;
 
-	status = (rp_pio->status & ~rp_pio->mask);
+	status &= ~mask;
 	for (i = 0; i < ARRAY_SIZE(rp_pio_error_string); i++) {
 		if (status & (1 << i))
 			dev_err(dev, "[%2d] %s%s\n", i, rp_pio_error_string[i],
-				rp_pio->first_error == i ? " (First)" : "");
+				first_error == i ? " (First)" : "");
 	}
 
 	if (dpc->rp_log_size < 4)
 		return;
 	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG,
-			      &rp_pio->header_log.dw0);
+			      &dw0);
 	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 4,
-			      &rp_pio->header_log.dw1);
+			      &dw1);
 	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 8,
-			      &rp_pio->header_log.dw2);
+			      &dw2);
 	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_HEADER_LOG + 12,
-			      &rp_pio->header_log.dw3);
+			      &dw3);
 	dev_err(dev, "TLP Header: %#010x %#010x %#010x %#010x\n",
-		rp_pio->header_log.dw0, rp_pio->header_log.dw1,
-		rp_pio->header_log.dw2, rp_pio->header_log.dw3);
+		dw0, dw1, dw2, dw3);
 
 	if (dpc->rp_log_size < 5)
 		return;
-	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG,
-			      &rp_pio->impspec_log);
-	dev_err(dev, "RP PIO ImpSpec Log %#010x\n", rp_pio->impspec_log);
+	pci_read_config_dword(pdev, cap + PCI_EXP_DPC_RP_PIO_IMPSPEC_LOG, &log);
+	dev_err(dev, "RP PIO ImpSpec Log %#010x\n", log);
 
 	for (i = 0; i < dpc->rp_log_size - 5; i++) {
 		pci_read_config_dword(pdev,
-			cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG,
-			&rp_pio->tlp_prefix_log[i]);
-		dev_err(dev, "TLP Prefix Header: dw%d, %#010x\n", i,
-			rp_pio->tlp_prefix_log[i]);
+			cap + PCI_EXP_DPC_RP_PIO_TLPPREFIX_LOG, &prefix);
+		dev_err(dev, "TLP Prefix Header: dw%d, %#010x\n", i, prefix);
 	}
 }
 
 static void dpc_process_rp_pio_error(struct dpc_dev *dpc)
 {
-	struct dpc_rp_pio_regs rp_pio_regs;
-
-	dpc_rp_pio_get_info(dpc, &rp_pio_regs);
+	dpc_rp_pio_get_info(dpc);
 
 }