system/linux
system/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux synced 2024-09-21 19:47:35 +00:00
Code Issues Packages Projects Releases Wiki Activity

spi: bcm-qspi: check for valid cs before applying chip select

Browse source 
Apply only valid chip select value. This change fixes case where chip
select is set to initial value of '-1' during probe and  PM supend and
subsequent resume can try to use the value with undefined behaviour.
Also in case where gpio based chip select, the check in
bcm_qspi_chip_select() shall prevent undefined behaviour on resume.

Fixes: fa236a7ef2 ("spi: bcm-qspi: Add Broadcom MSPI driver")
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220127185359.27322-1-kdasu.kdev@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Kamal Dasu 2022-01-27 13:53:59 -05:00 committed by Mark Brown
parent 37c2c83ca4
commit 2cbd27267f
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
1 changed files with 1 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/spi/spi-bcm-qspi.c
View file

@ -585,7 +585,7 @@ static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs)
u32 rd = 0;
u32 wr = 0;
if (qspi->base[CHIP_SELECT]) {
if (cs >= 0 && qspi->base[CHIP_SELECT]) {
rd = bcm_qspi_read(qspi, CHIP_SELECT, 0);
wr = (rd & ~0xff) | (1 << cs);
if (rd == wr)