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Message-ID: <5bf1ca2-92e2-25bb-10fa-59db2ed5839@linux.intel.com>
Date: Mon, 18 Dec 2023 14:30:04 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: rjingar <rajvi.jingar@...ux.intel.com>,
Hans de Goede <hdegoede@...hat.com>
cc: irenic.rajneesh@...il.com, david.e.box@...el.com, markgross@...nel.org,
platform-driver-x86@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] platform/x86/intel/pmc: Fix hang in
pmc_core_send_ltr_ignore()
On Fri, 15 Dec 2023, rjingar wrote:
> 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)
>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
I'll have to say though I really don't like they way that function is
playing with fire by mixing the use of signed and unsigned variables.
As is, this can only be triggered through a debugfs write and we're
already in -rc6 so IMO next material.
--
i.
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