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staging: iio: Fix incorrect existence check for a shared event pointer. 

A second smatch detected error. First part fixes in a typo
in the comment directly above that I noticed whilst trying
to remember what this code actually does. Second part is
the actual fix.  I'm fairly amazed this one never caused
trouble in testing as it is in one of the most common paths.

Signed-off-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jonathan Cameron 2010-01-09 17:01:33 +00:00 committed by Greg Kroah-Hartman
parent 75c8075394
commit 75b16013e2
1 changed files with 8 additions and 8 deletions
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16
drivers/staging/iio/industrialio-core.c
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@ -292,16 +292,16 @@ ssize_t iio_event_chrdev_read(struct file *filep,
mutex_unlock(&ev_int->event_list_lock); mutex_unlock(&ev_int->event_list_lock);
/* /*
* Possible concurency issue if an update of this event is on its way * Possible concurency issue if an update of this event is on its way
* through. May lead to new even being removed whilst the reported event * through. May lead to new event being removed whilst the reported
* was the unescalated event. In typical use case this is not a problem * event was the unescalated event. In typical use case this is not a
* as userspace will say read half the buffer due to a 50% full event * problem as userspace will say read half the buffer due to a 50%
* which would make the correct 100% full incorrect anyway. * full event which would make the correct 100% full incorrect anyway.
*/ */
spin_lock(&el->shared_pointer->lock); if (el->shared_pointer) {
if (el->shared_pointer) spin_lock(&el->shared_pointer->lock);
(el->shared_pointer->ev_p) = NULL; (el->shared_pointer->ev_p) = NULL;
spin_unlock(&el->shared_pointer->lock); spin_unlock(&el->shared_pointer->lock);
}
kfree(el); kfree(el);
return len; return len;