4.19-stable review patch. If anyone has any objections, please let me know.
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From: Christophe JAILLET christophe.jaillet@wanadoo.fr
[ 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 --- 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 c54986902b9d2..6dfd08dadb12d 100644 --- a/drivers/dma/pxa_dma.c +++ b/drivers/dma/pxa_dma.c @@ -772,7 +772,6 @@ 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;