linux-kernel - Re: [PATCH 1/11] kernel/kfifo.c: trivial: use BUG

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Date:	Tue, 2 Aug 2011 21:27:38 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Andrea Righi <arighi@...eler.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, trivial@...nel.org,
	kernel-janitors@...r.kernel.org,
	Stefani Seibold <stefani@...bold.net>,
	"Ira W. Snyder" <iws@...o.caltech.edu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/11] kernel/kfifo.c: trivial: use BUG_ON

From: Julia Lawall <julia@...u.dk>

Allow the function to return 0 when 0 elements are asked for rather than
crashing the kernel with BUG.

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 var/julia/linuxcopy/kernel/kfifo.c |    6 ------
 1 file changed, 6 deletions(-)

diff -u -p a/kernel/kfifo.c b/kernel/kfifo.c
index 01a0700..9f928ef 100644
--- a/var/linuxes/linux-next/kernel/kfifo.c
+++ b/var/julia/linuxcopy/kernel/kfifo.c
@@ -562,9 +562,6 @@ EXPORT_SYMBOL(__kfifo_to_user_r);
 unsigned int __kfifo_dma_in_prepare_r(struct __kfifo *fifo,
 	struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
 {
-	if (!nents)
-		BUG();
-
 	len = __kfifo_max_r(len, recsize);
 
 	if (len + recsize > kfifo_unused(fifo))
@@ -586,9 +583,6 @@ EXPORT_SYMBOL(__kfifo_dma_in_finish_r);
 unsigned int __kfifo_dma_out_prepare_r(struct __kfifo *fifo,
 	struct scatterlist *sgl, int nents, unsigned int len, size_t recsize)
 {
-	if (!nents)
-		BUG();
-
 	len = __kfifo_max_r(len, recsize);
 
 	if (len + recsize > fifo->in - fifo->out)
--
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