From: Roel Kluin <roel.kluin@gmail.com>
Date: Tue, 24 Feb 2009 18:19:48 +0000 (+0100)
Subject: i2c: Timeouts reach -1
X-Git-Tag: v5.15~35137^2~3
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=a746b578d8406b2db0e9f0d040061bc1f78433cf;p=mirror_ubuntu-kernels.git

i2c: Timeouts reach -1

With a postfix decrement these timeouts reach -1 rather than 0, but
after the loop it is tested whether they have become 0.

As pointed out by Jean Delvare, the condition we are waiting for should
also be tested before the timeout. With the current order, you could
exit with a timeout error while the job is actually done.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
---

diff --git a/drivers/i2c/busses/i2c-amd8111.c b/drivers/i2c/busses/i2c-amd8111.c
index edab51973bf5..a7c59908c457 100644
--- a/drivers/i2c/busses/i2c-amd8111.c
+++ b/drivers/i2c/busses/i2c-amd8111.c
@@ -72,7 +72,7 @@ static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
 {
 	int timeout = 500;
 
-	while (timeout-- && (inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF))
+	while ((inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_IBF) && --timeout)
 		udelay(1);
 
 	if (!timeout) {
@@ -88,7 +88,7 @@ static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
 {
 	int timeout = 500;
 
-	while (timeout-- && (~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF))
+	while ((~inb(smbus->base + AMD_EC_SC) & AMD_EC_SC_OBF) && --timeout)
 		udelay(1);
 
 	if (!timeout) {
diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c
index 6af68146c342..bdb1f7510e91 100644
--- a/drivers/i2c/busses/i2c-pxa.c
+++ b/drivers/i2c/busses/i2c-pxa.c
@@ -644,7 +644,7 @@ static int i2c_pxa_do_pio_xfer(struct pxa_i2c *i2c,
 
 	i2c_pxa_start_message(i2c);
 
-	while (timeout-- && i2c->msg_num > 0) {
+	while (i2c->msg_num > 0 && --timeout) {
 		i2c_pxa_handler(0, i2c);
 		udelay(10);
 	}