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| author | Roel Kluin <roel.kluin@gmail.com> | 2009-02-25 21:26:21 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-03-16 17:32:45 -0700 |
| commit | da1691723de56d42dd809be15f309d2ba45cfdcc (patch) | |
| tree | befed47cbdb7de774f9a375076a5a0a87338182b | |
| parent | dabfaa8e99183fdff08d831acebde97a79ffb5dd (diff) | |
| download | linux-stable-da1691723de56d42dd809be15f309d2ba45cfdcc.tar.gz | |
i2c: Timeouts reach -1
commit a746b578d8406b2db0e9f0d040061bc1f78433cf upstream
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-amd8111.c | 4 | ||||
| -rw-r--r-- | drivers/i2c/busses/i2c-pxa.c | 2 |
2 files changed, 3 insertions, 3 deletions
diff --git a/drivers/i2c/busses/i2c-amd8111.c b/drivers/i2c/busses/i2c-amd8111.c index 3972208876b3..c68823738802 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 906f9b9d715d..7f80d51296f8 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); } |