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i2c: designware-baytrail: fix potential null pointer dereference on dev

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The assignment to addr requires a call to get_sem_addr that dereferences
dev, however, this dereference occurs before a null pointer check on dev.
Move this assignment after the null check on dev to avoid a potential null
pointer dereference.

Detected by CoverityScan, CID#1419700 ("Dereference before null check")

Fixes: fd476fa22a ("i2c: designware-baytrail: Add support for cherrytrail")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Colin Ian King 2017-03-20 11:51:23 +00:00 committed by Wolfram Sang
parent bd698d24b1
commit c7f82ea860
1 changed files with 3 additions and 1 deletions
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drivers/i2c/busses/i2c-designware-baytrail.c
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@ -70,7 +70,7 @@ static void reset_semaphore(struct dw_i2c_dev *dev)
static int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
{
u32 addr = get_sem_addr(dev);
u32 addr;
u32 sem = PUNIT_SEMAPHORE_ACQUIRE;
int ret;
unsigned long start, end;
@ -94,6 +94,8 @@ static int baytrail_i2c_acquire(struct dw_i2c_dev *dev)
*/
pm_qos_update_request(&dev->pm_qos, 0);
addr = get_sem_addr(dev);
/* host driver writes to side band semaphore register */
ret = iosf_mbi_write(BT_MBI_UNIT_PMC, MBI_REG_WRITE, addr, sem);
if (ret) {