ARM: PL08x: fix a leak when preparing TXDs

If we fail to allocate the LLI, the prep_* function will return NULL.
However, the TXD we allocated will not be placed on any list, nor
will it be freed - we'll just drop all references to it.  Make sure
we free it rather than leaking TXDs.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index 69cfb05e4d3c..b3b3180ce561 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -1332,9 +1332,10 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
         int ret;
 
         num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
-
-        if (!num_llis)
+        if (!num_llis) {
+                kfree(txd);
                 return -EINVAL;
+        }
 
         spin_lock_irqsave(&plchan->lock, plchan->lockflags);