All of lore.kernel.org
 help / color / mirror / Atom feed
From: Tasos Sahanidis <tasos@tasossah.com>
To: linux-media@vger.kernel.org
Cc: Tasos Sahanidis <tasos@tasossah.com>
Subject: [PATCH] media: saa7134: use sg_dma_len when building pgtable
Date: Wed, 3 Mar 2021 20:30:18 +0200	[thread overview]
Message-ID: <6fe62d6e-b366-16f9-faa5-990d284e9656@tasossah.com> (raw)

The new AMD IOMMU DMA implementation concatenates sglist entries under
certain conditions, and because saa7134 accessed the length member
directly, it did not support this scenario.

This fixes IO_PAGE_FAULTs and choppy DMA audio by using the
sg_dma_len macro.

Fixes: be62dbf554c5 ("iommu/amd: Convert AMD iommu driver to the dma-iommu api")
Signed-off-by: Tasos Sahanidis <tasos@tasossah.com>
---
 drivers/media/pci/saa7134/saa7134-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/pci/saa7134/saa7134-core.c b/drivers/media/pci/saa7134/saa7134-core.c
index 391572a6ec76..efb757d5168a 100644
--- a/drivers/media/pci/saa7134/saa7134-core.c
+++ b/drivers/media/pci/saa7134/saa7134-core.c
@@ -243,7 +243,7 @@ int saa7134_pgtable_build(struct pci_dev *pci, struct saa7134_pgtable *pt,
 
 	ptr = pt->cpu + startpage;
 	for (i = 0; i < length; i++, list = sg_next(list)) {
-		for (p = 0; p * 4096 < list->length; p++, ptr++)
+		for (p = 0; p * 4096 < sg_dma_len(list); p++, ptr++)
 			*ptr = cpu_to_le32(sg_dma_address(list) +
 						list->offset + p * 4096);
 	}
-- 
2.25.1

                 reply	other threads:[~2021-03-04  0:32 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

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=6fe62d6e-b366-16f9-faa5-990d284e9656@tasossah.com \
    --to=tasos@tasossah.com \
    --cc=linux-media@vger.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.