linux-kernel - [PATCH 1/2] platform/x86/intel/pmc: Fix hang in pmc_core_send_ltr

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Message-Id: <20231216011650.1973941-1-rajvi.jingar@linux.intel.com>
Date: Fri, 15 Dec 2023 17:16:50 -0800
From: rjingar <rajvi.jingar@...ux.intel.com>
To: irenic.rajneesh@...il.com,
	david.e.box@...el.com,
	hdegoede@...hat.com,
	ilpo.jarvinen@...ux.intel.com,
	markgross@...nel.org,
	platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: rajvi.jingar@...ux.intel.com
Subject: [PATCH 1/2] platform/x86/intel/pmc: Fix hang in pmc_core_send_ltr_ignore()

From: Rajvi Jingar <rajvi.jingar@...ux.intel.com>

For input value 0, PMC stays unassigned which causes crash while trying
to access PMC for register read/write. Include LTR index 0 in pmc_index
and ltr_index calculation.

Fixes: 2bcef4529222 ("platform/x86:intel/pmc: Enable debugfs multiple PMC support")
Signed-off-by: Rajvi Jingar <rajvi.jingar@...ux.intel.com>
---
 drivers/platform/x86/intel/pmc/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel/pmc/core.c b/drivers/platform/x86/intel/pmc/core.c
index 983e3a8f4910..55eb6a4683fb 100644
--- a/drivers/platform/x86/intel/pmc/core.c
+++ b/drivers/platform/x86/intel/pmc/core.c
@@ -474,7 +474,7 @@ int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value)
 	 * is based on the contiguous indexes from ltr_show output.
 	 * pmc index and ltr index needs to be calculated from it.
 	 */
-	for (pmc_index = 0; pmc_index < ARRAY_SIZE(pmcdev->pmcs) && ltr_index > 0; pmc_index++) {
+	for (pmc_index = 0; pmc_index < ARRAY_SIZE(pmcdev->pmcs) && ltr_index >= 0; pmc_index++) {
 		pmc = pmcdev->pmcs[pmc_index];
 
 		if (!pmc)
-- 
2.34.1