[PATCH 3.16 059/366] media: smiapp: fix timeout checking in smiapp_read_nvm

Ben Hutchings
2018-11-11T19:49:05Z

From: Colin Ian King <colin.king@canonical.com>

commit 7a2148dfda8001c983f0effd9afd8a7fa58e99c4 upstream.

The current code decrements the timeout counter i and the end of
each loop i is incremented, so the check for timeout will always
be false and hence the timeout mechanism is just a dead code path.
Potentially, if the RD_READY bit is not set, we could end up in
an infinite loop.

Fix this so the timeout starts from 1000 and decrements to zero,
if at the end of the loop i is zero we have a timeout condition.

Detected by CoverityScan, CID#1324008 ("Logically dead code")

Fixes: ccfc97bdb5ae ("[media] smiapp: Add driver")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/media/i2c/smiapp/smiapp-core.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)

--- a/drivers/media/i2c/smiapp/smiapp-core.c
+++ b/drivers/media/i2c/smiapp/smiapp-core.c
@@ -899,7 +899,7 @@ static int smiapp_read_nvm(struct smiapp
if (rval)
goto out;

- for (i = 0; i < 1000; i++) {
+ for (i = 1000; i > 0; i--) {
rval = smiapp_read(
sensor,
SMIAPP_REG_U8_DATA_TRANSFER_IF_1_STATUS, &s);
@@ -910,11 +910,10 @@ static int smiapp_read_nvm(struct smiapp
if (s & SMIAPP_DATA_TRANSFER_IF_1_STATUS_RD_READY)
break;

- if (--i == 0) {
- rval = -ETIMEDOUT;
- goto out;
- }
-
+ }
+ if (!i) {
+ rval = -ETIMEDOUT;
+ goto out;
}

for (i = 0; i < SMIAPP_NVM_PAGE_SIZE; i++) {