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hwmon: Add mutex protecting for sbtsi read/write through hwmon

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Add a mutex and take it around SBTSI read/write paths so that only
one transaction runs at a time. The lock is held only for the
duration of the bus transfer and associated driver bookkeeping, not
across blocking work unrelated to SBTSI.

This is a concurrency hardening fix.

Reviewed-by: Akshay Gupta <Akshay.Gupta@amd.com>
Signed-off-by: Prathima <Prathima.Lk@amd.com>
Acked-by: Guenter Roeck <linux@roeck-us.net>
Link: https://patch.msgid.link/20260710111642.850022-8-Akshay.Gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Prathima 2026-07-10 16:46:41 +05:30 committed by Greg Kroah-Hartman
parent 48ad55cda0
commit 47f6311f8f
1 changed files with 2 additions and 0 deletions
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2
drivers/hwmon/sbtsi_temp.c
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@ -70,6 +70,7 @@ static int sbtsi_temp_read(struct sbtsi_data *data, u8 reg1, u8 reg2,
{
int ret;
guard(sbtsi)(data);
ret = sbtsi_xfer(data, reg1, val1, true);
if (!ret)
ret = sbtsi_xfer(data, reg2, val2, true);
@ -84,6 +85,7 @@ static int sbtsi_temp_write(struct sbtsi_data *data, u8 reg_int, u8 reg_dec,
{
int ret;
guard(sbtsi)(data);
ret = sbtsi_xfer(data, reg_int, &val_int, false);
if (!ret)
ret = sbtsi_xfer(data, reg_dec, &val_dec, false);