A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-28 10:41:38 -04:00
Code Issues Projects Releases Packages Wiki Activity

zram: fix return value on writeback_store

Browse source 
commit 57e0076e6575a7b7cef620a0bd2ee2549ef77818 upstream.

writeback_store's return value is overwritten by submit_bio_wait's return
value.  Thus, writeback_store will return zero since there was no IO
error.  In the end, write syscall from userspace will see the zero as
return value, which could make the process stall to keep trying the write
until it will succeed.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: 3b82a051c101("drivers/block/zram/zram_drv.c: fix error return codes not being returned in writeback_store")
Signed-off-by: Minchan Kim <[email protected]>
Cc: Sergey Senozhatsky <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: John Dias <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Minchan Kim 2021-03-12 21:08:38 -08:00 • committed by Greg Kroah-Hartman
commit 2306580a95
1 changed files with 8 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

11
drivers/block/zram/zram_drv.c
View file

@ -627,7 +627,7 @@ static ssize_t writeback_store(struct device *dev,
struct bio_vec bio_vec;
struct page *page;
ssize_t ret = len;
int mode;
int mode, err;
unsigned long blk_idx = 0;
if (sysfs_streq(buf, "idle"))
@ -719,12 +719,17 @@ static ssize_t writeback_store(struct device *dev,
* XXX: A single page IO would be inefficient for write
* but it would be not bad as starter.
*/
ret = submit_bio_wait(&bio);
if (ret) {
err = submit_bio_wait(&bio);
if (err) {
zram_slot_lock(zram, index);
zram_clear_flag(zram, index, ZRAM_UNDER_WB);
zram_clear_flag(zram, index, ZRAM_IDLE);
zram_slot_unlock(zram, index);
/*
* Return last IO error unless every IO were
* not suceeded.
*/
ret = err;
continue;
}