diff options
| author | Duoming Zhou <duoming@zju.edu.cn> | 2023-01-18 22:10:00 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-01-19 17:22:38 +0100 |
| commit | 70fae37a09268455b8ab4f64647086b61da6f39c (patch) | |
| tree | 12fcddc6a5e89c1c5f0e8fd8f2ed4ac4e6e1d36c /drivers/char | |
| parent | af35dbad4a4af023536c17d9bc91a77171bc35df (diff) | |
Revert "char: pcmcia: cm4000_cs: Replace mdelay with usleep_range in set_protocol"
This reverts commit be826ada52f1fcabed5b5217c94609ebf5967211.
The function monitor_card() is a timer handler that runs in an
atomic context, but it calls usleep_range() that can sleep.
As a result, the sleep-in-atomic-context bugs will happen.
The process is shown below:
(atomic context)
monitor_card()
set_protocol()
usleep_range() //sleep
The origin commit c1986ee9bea3 ("[PATCH] New Omnikey Cardman
4000 driver") works fine.
Fixes: be826ada52f1 ("char: pcmcia: cm4000_cs: Replace mdelay with usleep_range in set_protocol")
Signed-off-by: Duoming Zhou <duoming@zju.edu.cn>
Link: https://lore.kernel.org/r/20230118141000.5580-1-duoming@zju.edu.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/pcmcia/cm4000_cs.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/char/pcmcia/cm4000_cs.c b/drivers/char/pcmcia/cm4000_cs.c index adaec8fd4b16..e656f42a28ac 100644 --- a/drivers/char/pcmcia/cm4000_cs.c +++ b/drivers/char/pcmcia/cm4000_cs.c @@ -529,7 +529,8 @@ static int set_protocol(struct cm4000_dev *dev, struct ptsreq *ptsreq) DEBUGP(5, dev, "NumRecBytes is valid\n"); break; } - usleep_range(10000, 11000); + /* can not sleep as this is in atomic context */ + mdelay(10); } if (i == 100) { DEBUGP(5, dev, "Timeout waiting for NumRecBytes getting " @@ -549,7 +550,8 @@ static int set_protocol(struct cm4000_dev *dev, struct ptsreq *ptsreq) } break; } - usleep_range(10000, 11000); + /* can not sleep as this is in atomic context */ + mdelay(10); } /* check whether it is a short PTS reply? */ |