From: Jia-Ju Bai <baijiaju1990@gmail.com>
To: nicolas.ferre@microchip.com, rafalo@cadence.com, bfolta@cadence.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
Jia-Ju Bai <baijiaju1990@gmail.com>
Subject: [PATCH] macb: Fix a possible sleep-in-atomic bug in macb_tx_error_task
Date: Wed, 13 Dec 2017 18:46:14 +0800 [thread overview]
Message-ID: <1513161974-15610-1-git-send-email-baijiaju1990@gmail.com> (raw)
The driver may sleep under a spinlock.
The function call path is:
macb_tx_error_task (acquire the spinlock)
macb_halt_tx
usleep_range --> may sleep
To fix it, usleep_range is replaced with udelay.
This bug is found by my static analysis tool(DSAC) and checked by my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
---
drivers/net/ethernet/cadence/macb_main.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
index 72a67f7..b02c806 100644
--- a/drivers/net/ethernet/cadence/macb_main.c
+++ b/drivers/net/ethernet/cadence/macb_main.c
@@ -645,7 +645,7 @@ static int macb_halt_tx(struct macb *bp)
if (!(status & MACB_BIT(TGO)))
return 0;
- usleep_range(10, 250);
+ udelay(250);
} while (time_before(halt_time, timeout));
return -ETIMEDOUT;
--
1.7.9.5
reply other threads:[~2017-12-13 10:46 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=1513161974-15610-1-git-send-email-baijiaju1990@gmail.com \
--to=baijiaju1990@gmail.com \
--cc=bfolta@cadence.com \
--cc=linux-kernel@vger.kernel.org \
--cc=netdev@vger.kernel.org \
--cc=nicolas.ferre@microchip.com \
--cc=rafalo@cadence.com \
/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