diff mbox

sata_sx4: Check return code from pdc20621_i2c_read()

Message ID 1438629493-17610-1-git-send-email-barletz@gmail.com
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Tomer Barletz Aug. 3, 2015, 7:18 p.m. UTC 
The variable spd0 might be used uninitialized when pdc20621_i2c_read()
fails.
This also generates a compilation warning with gcc 5.1.

Signed-off-by: Tomer Barletz <barletz@gmail.com>
---
 drivers/ata/sata_sx4.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

Comments

Tejun Heo Aug. 6, 2015, 4:40 p.m. UTC | #1 
On Mon, Aug 03, 2015 at 12:18:13PM -0700, Tomer Barletz wrote:
> The variable spd0 might be used uninitialized when pdc20621_i2c_read()
> fails.
> This also generates a compilation warning with gcc 5.1.
> 
> Signed-off-by: Tomer Barletz <barletz@gmail.com>

Applied to libata/for-4.2-fixes with minor edits.

Thanks.
diff mbox

Patch

diff --git a/drivers/ata/sata_sx4.c b/drivers/ata/sata_sx4.c
index 3a18a8a..b482c25 100644
--- a/drivers/ata/sata_sx4.c
+++ b/drivers/ata/sata_sx4.c
@@ -1238,8 +1238,12 @@  static unsigned int pdc20621_prog_dimm_global(struct ata_host *host)
 	readl(mmio + PDC_SDRAM_CONTROL);
 
 	/* Turn on for ECC */
-	pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
-			  PDC_DIMM_SPD_TYPE, &spd0);
+	if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
+			       PDC_DIMM_SPD_TYPE, &spd0)) {
+		printk(KERN_ERR "Failed in i2c read: device=%#x, subaddr=%#x\n",
+		       PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
+		return 1;
+	}
 	if (spd0 == 0x02) {
 		data |= (0x01 << 16);
 		writel(data, mmio + PDC_SDRAM_CONTROL);
@@ -1380,8 +1384,12 @@  static unsigned int pdc20621_dimm_init(struct ata_host *host)
 
 	/* ECC initiliazation. */
 
-	pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
-			  PDC_DIMM_SPD_TYPE, &spd0);
+	if (!pdc20621_i2c_read(host, PDC_DIMM0_SPD_DEV_ADDRESS,
+			       PDC_DIMM_SPD_TYPE, &spd0)) {
+		printk(KERN_ERR "Failed in i2c read: device=%#x, subaddr=%#x\n",
+		       PDC_DIMM0_SPD_DEV_ADDRESS, PDC_DIMM_SPD_TYPE);
+		return 1;
+	}
 	if (spd0 == 0x02) {
 		void *buf;
 		VPRINTK("Start ECC initialization\n");