From: Raag Jadav <raagjadav@gmail.com>
To: dmaengine@vger.kernel.org, Vinod Koul <vkoul@kernel.org>
Cc: Raag Jadav <raagjadav@gmail.com>,
Ludovic Desroches <ludovic.desroches@microchip.com>,
Dan Williams <dan.j.williams@intel.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH] dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback
Date: Sat, 29 Jun 2019 13:50:48 +0530 [thread overview]
Message-ID: <1561796448-3321-1-git-send-email-raagjadav@gmail.com> (raw)
tx descriptor retrieved from an empty xfers_list may not have valid
pointers to the callback functions.
Avoid calling dmaengine_desc_get_callback_invoke if xfers_list is empty.
Signed-off-by: Raag Jadav <raagjadav@gmail.com>
---
drivers/dma/at_xdmac.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 627ef3e..b58ac72 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -1568,11 +1568,14 @@ static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan)
struct at_xdmac_desc *desc;
struct dma_async_tx_descriptor *txd;
- desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node);
- txd = &desc->tx_dma_desc;
+ if (!list_empty(&atchan->xfers_list)) {
+ desc = list_first_entry(&atchan->xfers_list,
+ struct at_xdmac_desc, xfer_node);
+ txd = &desc->tx_dma_desc;
- if (txd->flags & DMA_PREP_INTERRUPT)
- dmaengine_desc_get_callback_invoke(txd, NULL);
+ if (txd->flags & DMA_PREP_INTERRUPT)
+ dmaengine_desc_get_callback_invoke(txd, NULL);
+ }
}
static void at_xdmac_handle_error(struct at_xdmac_chan *atchan)
--
2.7.4
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-06-29 8:22 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-29 8:20 Raag Jadav [this message]
2019-07-01 8:00 ` [PATCH] dmaengine: at_xdmac: check for non-empty xfers_list before invoking callback Ludovic Desroches
2019-07-07 17:17 ` Vinod Koul
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1561796448-3321-1-git-send-email-raagjadav@gmail.com \
--to=raagjadav@gmail.com \
--cc=dan.j.williams@intel.com \
--cc=dmaengine@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=ludovic.desroches@microchip.com \
--cc=vkoul@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).