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| author | Roel Kluin <roel.kluin@gmail.com> | 2010-01-16 20:43:12 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@linux-fr.org> | 2010-01-16 20:43:12 +0100 |
| commit | b6a3195070fe1c12d0bb1099ffe997d8abf9f602 (patch) | |
| tree | c53534397e22f9260820a635a3f3537d1a416748 /drivers/i2c | |
| parent | 0b2c3688445ff02d3f1bfffc6983417b28f8c3da (diff) | |
| download | lwn-b6a3195070fe1c12d0bb1099ffe997d8abf9f602.tar.gz lwn-b6a3195070fe1c12d0bb1099ffe997d8abf9f602.zip | |
i2c: Test off by one in {piix4,vt596}_transaction()
With `while (timeout++ < MAX_TIMEOUT)' timeout reaches MAX_TIMEOUT + 1
after the loop. This is probably unlikely to produce a problem.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-piix4.c | 4 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-viapro.c | 4 |
2 files changed, 4 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c index 1e245e9cad31..e56e4b6823ca 100644 --- a/drivers/i2c/busses/i2c-piix4.c +++ b/drivers/i2c/busses/i2c-piix4.c @@ -324,12 +324,12 @@ static int piix4_transaction(void) else msleep(1); - while ((timeout++ < MAX_TIMEOUT) && + while ((++timeout < MAX_TIMEOUT) && ((temp = inb_p(SMBHSTSTS)) & 0x01)) msleep(1); /* If the SMBus is still busy, we give up */ - if (timeout >= MAX_TIMEOUT) { + if (timeout == MAX_TIMEOUT) { dev_err(&piix4_adapter.dev, "SMBus Timeout!\n"); result = -ETIMEDOUT; } diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c index e4b1543015af..a84a909e1234 100644 --- a/drivers/i2c/busses/i2c-viapro.c +++ b/drivers/i2c/busses/i2c-viapro.c @@ -165,10 +165,10 @@ static int vt596_transaction(u8 size) do { msleep(1); temp = inb_p(SMBHSTSTS); - } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT)); + } while ((temp & 0x01) && (++timeout < MAX_TIMEOUT)); /* If the SMBus is still busy, we give up */ - if (timeout >= MAX_TIMEOUT) { + if (timeout == MAX_TIMEOUT) { result = -ETIMEDOUT; dev_err(&vt596_adapter.dev, "SMBus timeout!\n"); } |