From: Linus Walleij <linus.walleij@linaro.org>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
Geert Uytterhoeven <geert@linux-m68k.org>,
Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH] mmc: sh_mmcif: sg_miter does not need to be atomic
Date: Tue, 20 Feb 2024 23:58:45 +0100 [thread overview]
Message-ID: <20240220-fix-sh-mmcif-v1-1-b9d08a787c1f@linaro.org> (raw)
All the sglist iterations happen in the *threaded* interrupt handler
and that context is not atomic, so don't request an atomic
sglist miter. Using an atomic miter results in "BUG: scheduling while
atomic" splats.
Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: 27b57277d9ba ("mmc: sh_mmcif: Use sg_miter for PIO")
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Hi Geert, it'd be great if you could test this!
---
drivers/mmc/host/sh_mmcif.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 1ef6e153e5a3..669555b5e8fa 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -607,7 +607,7 @@ static void sh_mmcif_single_read(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK) + 3;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len,
- SG_MITER_ATOMIC | SG_MITER_TO_SG);
+ SG_MITER_TO_SG);
host->wait_for = MMCIF_WAIT_FOR_READ;
@@ -662,7 +662,7 @@ static void sh_mmcif_multi_read(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len,
- SG_MITER_ATOMIC | SG_MITER_TO_SG);
+ SG_MITER_TO_SG);
host->wait_for = MMCIF_WAIT_FOR_MREAD;
@@ -710,7 +710,7 @@ static void sh_mmcif_single_write(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK) + 3;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len,
- SG_MITER_ATOMIC | SG_MITER_FROM_SG);
+ SG_MITER_FROM_SG);
host->wait_for = MMCIF_WAIT_FOR_WRITE;
@@ -765,7 +765,7 @@ static void sh_mmcif_multi_write(struct sh_mmcif_host *host,
BLOCK_SIZE_MASK;
sg_miter_start(&host->sg_miter, data->sg, data->sg_len,
- SG_MITER_ATOMIC | SG_MITER_FROM_SG);
+ SG_MITER_FROM_SG);
host->wait_for = MMCIF_WAIT_FOR_MWRITE;
---
base-commit: 2d5c7b7eb345249cb34d42cbc2b97b4c57ea944e
change-id: 20240220-fix-sh-mmcif-49c1de70c5b7
Best regards,
--
Linus Walleij <linus.walleij@linaro.org>
next reply other threads:[~2024-02-20 22:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-02-20 22:58 Linus Walleij [this message]
2024-02-21 9:43 ` [PATCH] mmc: sh_mmcif: sg_miter does not need to be atomic Geert Uytterhoeven
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=20240220-fix-sh-mmcif-v1-1-b9d08a787c1f@linaro.org \
--to=linus.walleij@linaro.org \
--cc=geert@linux-m68k.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mmc@vger.kernel.org \
--cc=ulf.hansson@linaro.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 read-only IMAP folder(s) and NNTP newsgroup(s).