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staging: fieldbus: anybus-s: fix wait_for_completion_timeout return handling

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wait_for_completion_timeout() returns unsigned long (0 on timeout or
remaining jiffies) not int. Assigning this return value to int may
theoretically overflow (though not in this case where TIMEOUT is
only HZ*2).

Fix this inconsistency by wrapping the wait_for_completion_timeout
into the if().

Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
Reviewed-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicholas Mc Guire 2019-05-01 10:38:12 -04:00 committed by Greg Kroah-Hartman
parent 91b6cb7216
commit 3e2e9cf9ee
1 changed files with 2 additions and 3 deletions
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5
drivers/staging/fieldbus/anybuss/host.c
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@ -1325,11 +1325,10 @@ anybuss_host_common_probe(struct device *dev,
* interrupt came in: ready to go !
*/
reset_deassert(cd);
ret = wait_for_completion_timeout(&cd->card_boot, TIMEOUT);
if (ret == 0)
if (!wait_for_completion_timeout(&cd->card_boot, TIMEOUT)) {
ret = -ETIMEDOUT;
if (ret < 0)
goto err_reset;
}
/*
* according to the anybus docs, we're allowed to read these
* without handshaking / reserving the area