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platform/x86/intel/pmc: Fix hang in pmc_core_send_ltr_ignore()

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[ Upstream commit fbcf67ce5a ]

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: 2bcef45292 ("platform/x86:intel/pmc: Enable debugfs multiple PMC support")
Signed-off-by: Rajvi Jingar <rajvi.jingar@linux.intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20231216011650.1973941-1-rajvi.jingar@linux.intel.com
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rajvi Jingar 2023-12-15 17:16:50 -08:00 committed by Greg Kroah-Hartman
parent 602490b469
commit dd691e300d
1 changed files with 1 additions and 1 deletions
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2
drivers/platform/x86/intel/pmc/core.c
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@ -472,7 +472,7 @@ 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)