MIRRORS/linux-yocto
1
0
Fork 0
mirror of git://git.yoctoproject.org/linux-yocto.git synced 2025-10-23 07:23:12 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

i2c: qup: jump out of the loop in case of timeout

Browse Source 
Original logic only sets the return value but doesn't jump out of the
loop if the bus is kept active by a client. This is not expected. A
malicious or buggy i2c client can hang the kernel in this case and
should be avoided. This is observed during a long time test with a
PCA953x GPIO extender.

Fix it by changing the logic to not only sets the return value, but also
jumps out of the loop and return to the caller with -ETIMEDOUT.

Fixes: fbfab1ab06 ("i2c: qup: reorganization of driver code to remove polling for qup v1")
Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
Cc: <stable@vger.kernel.org> # v4.17+
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250616-qca-i2c-v1-1-2a8d37ee0a30@outlook.com
This commit is contained in:
Yang Xiwen 2025-06-16 00:01:10 +08:00 committed by Andi Shyti
parent a663b3c47a
commit a7982a14b3
1 changed files with 3 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/i2c/busses/i2c-qup.c
View File

@ -452,8 +452,10 @@ static int qup_i2c_bus_active(struct qup_i2c_dev *qup, int len)
if (!(status & I2C_STATUS_BUS_ACTIVE)) if (!(status & I2C_STATUS_BUS_ACTIVE))
break; break;
if (time_after(jiffies, timeout)) if (time_after(jiffies, timeout)) {
ret = -ETIMEDOUT; ret = -ETIMEDOUT;
break;
}
usleep_range(len, len * 2); usleep_range(len, len * 2);
} }