linux-kernel - [PATCH 5.18 0996/1095] PCI/AER: Iterate over error counters instead of error strings

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Date:   Mon, 15 Aug 2022 20:06:35 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Meeta Saggi <msaggi@...estorage.com>,
        Mohamed Khalfella <mkhalfella@...estorage.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Eric Badger <ebadger@...estorage.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0996/1095] PCI/AER: Iterate over error counters instead of error strings

From: Mohamed Khalfella <mkhalfella@...estorage.com>

[ Upstream commit 5e6ae050955b566484f3cc6a66e3925eae87a0ed ]

Previously we iterated over AER stat *names*, e.g.,
aer_correctable_error_string[32], but the actual stat *counters* may not be
that large, e.g., pdev->aer_stats->dev_cor_errs[16], which means that we
printed junk in the sysfs stats files.

Iterate over the stat counter arrays instead of the names to avoid this
junk.

Also, added a build time check to make sure all
counters have entries in strings array.

Fixes: 0678e3109a3c ("PCI/AER: Simplify __aer_print_error()")
Link: https://lore.kernel.org/r/20220509181441.31884-1-mkhalfella@purestorage.com
Reported-by: Meeta Saggi <msaggi@...estorage.com>
Signed-off-by: Mohamed Khalfella <mkhalfella@...estorage.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Meeta Saggi <msaggi@...estorage.com>
Reviewed-by: Eric Badger <ebadger@...estorage.com>
Cc: stable@...r.kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/pcie/aer.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index 7952e5efd6cf..a1e38ca93cd9 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -538,7 +538,7 @@ static const char *aer_agent_string[] = {
 	u64 *stats = pdev->aer_stats->stats_array;			\
 	size_t len = 0;							\
 									\
-	for (i = 0; i < ARRAY_SIZE(strings_array); i++) {		\
+	for (i = 0; i < ARRAY_SIZE(pdev->aer_stats->stats_array); i++) {\
 		if (strings_array[i])					\
 			len += sysfs_emit_at(buf, len, "%s %llu\n",	\
 					     strings_array[i],		\
@@ -1347,6 +1347,11 @@ static int aer_probe(struct pcie_device *dev)
 	struct device *device = &dev->device;
 	struct pci_dev *port = dev->port;
 
+	BUILD_BUG_ON(ARRAY_SIZE(aer_correctable_error_string) <
+		     AER_MAX_TYPEOF_COR_ERRS);
+	BUILD_BUG_ON(ARRAY_SIZE(aer_uncorrectable_error_string) <
+		     AER_MAX_TYPEOF_UNCOR_ERRS);
+
 	/* Limit to Root Ports or Root Complex Event Collectors */
 	if ((pci_pcie_type(port) != PCI_EXP_TYPE_RC_EC) &&
 	    (pci_pcie_type(port) != PCI_EXP_TYPE_ROOT_PORT))
-- 
2.35.1