From: Christophe JAILLET christophe.jaillet@wanadoo.fr
stable inclusion from stable-v6.6.2 commit ca2294c1275ab57bd27d0a279ea0c8ed9fc0a029 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8IW7G
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit 83c761f568733277ce1f7eb9dc9e890649c29a8c ]
If pxad_alloc_desc() fails on the first dma_pool_alloc() call, then sw_desc->nb_desc is zero. In such a case pxad_free_desc() is called and it will BUG_ON().
Remove this erroneous BUG_ON().
It is also useless, because if "sw_desc->nb_desc == 0", then, on the first iteration of the for loop, i is -1 and the loop will not be executed. (both i and sw_desc->nb_desc are 'int')
Fixes: a57e16cf0333 ("dmaengine: pxa: add pxa dmaengine driver") Signed-off-by: Christophe JAILLET christophe.jaillet@wanadoo.fr Link: https://lore.kernel.org/r/c8fc5563c9593c914fde41f0f7d1489a21b45a9a.169667678... Signed-off-by: Vinod Koul vkoul@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/dma/pxa_dma.c | 1 - 1 file changed, 1 deletion(-)
diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c index 1b046d9a3a26..16d342654da2 100644 --- a/drivers/dma/pxa_dma.c +++ b/drivers/dma/pxa_dma.c @@ -722,7 +722,6 @@ static void pxad_free_desc(struct virt_dma_desc *vd) dma_addr_t dma; struct pxad_desc_sw *sw_desc = to_pxad_sw_desc(vd);
- BUG_ON(sw_desc->nb_desc == 0); for (i = sw_desc->nb_desc - 1; i >= 0; i--) { if (i > 0) dma = sw_desc->hw_desc[i - 1]->ddadr;