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kfifo: Make kfifo_initialized work after kfifo_free

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After kfifo rework it's no longer possible to reliably know if kfifo is
usable, since after kfifo_free(), kfifo_initialized() would still return
true. The correct behaviour is needed for at least FHCI USB driver.

This patch fixes the issue by resetting the kfifo to zero values (the
same approach is used in kfifo_alloc() if allocation failed).

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Anton Vorontsov 2010-01-27 17:09:34 +03:00 committed by Greg Kroah-Hartman
parent 1ebca9dad5
commit 1a02d59aba
1 changed files with 1 additions and 0 deletions
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1
kernel/kfifo.c
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@ -97,6 +97,7 @@ EXPORT_SYMBOL(kfifo_alloc);
void kfifo_free(struct kfifo *fifo)
{
kfree(fifo->buffer);
_kfifo_init(fifo, NULL, 0);
}
EXPORT_SYMBOL(kfifo_free);