Commit a9c465f0 authored by Ivan Djelic's avatar Ivan Djelic Committed by David Woodhouse

mtd: nand: omap: fix race condition in omap_wait()

If a context switch occurs in function omap_wait() just before the
while loop is entered, then upon return from context switch the
timeout may already have elapsed: in that case, status is never
read from NAND device, and omap_wait() returns an error.
This failure has been experimentally observed during stress tests.

This patch ensures a NAND status read is always performed before
returning, as in the generic nand_wait() function.
Signed-off-by: default avatarIvan Djelic <ivan.djelic@parrot.com>
Signed-off-by: default avatarArtem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent e25da1c0
......@@ -881,7 +881,7 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
struct omap_nand_info *info = container_of(mtd, struct omap_nand_info,
mtd);
unsigned long timeo = jiffies;
int status = NAND_STATUS_FAIL, state = this->state;
int status, state = this->state;
if (state == FL_ERASING)
timeo += (HZ * 400) / 1000;
......@@ -896,6 +896,8 @@ static int omap_wait(struct mtd_info *mtd, struct nand_chip *chip)
break;
cond_resched();
}
status = gpmc_nand_read(info->gpmc_cs, GPMC_NAND_DATA);
return status;
}
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment