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| author | Dmitry Eremin-Solenikov <dbaryshkov@gmail.com> | 2015-03-30 14:33:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-05-24 12:24:35 -0700 |
| commit | d3046ba809ce4a3c34d605000cdce48c6ba54b6c (patch) | |
| tree | ce73eeaf680c8ca5366769e4abede7da008a6cb4 | |
| parent | 7879b1d94badb5c34fa777244091c2304191dddf (diff) | |
| download | linux-d3046ba809ce4a3c34d605000cdce48c6ba54b6c.tar.gz linux-d3046ba809ce4a3c34d605000cdce48c6ba54b6c.tar.bz2 linux-d3046ba809ce4a3c34d605000cdce48c6ba54b6c.zip | |
pcmcia: fix a boot time warning in pcmcia cs code
During bootup pcmcia (pccardd) code enforces the following warning
backtrace:
do not call blocking ops when !TASK_RUNNING; state=1 set at [<c0319e74>] pccardd+0xb8/0x3fc
Modules linked in:
CPU: 0 PID: 14 Comm: pccardd Not tainted 4.0.0-rc6+ #11
Hardware name: Sharp-Collie
[<c0105cd8>] (unwind_backtrace) from [<c0103ef8>] (show_stack+0x10/0x14)
[<c0103ef8>] (show_stack) from [<c010e9b8>] (warn_slowpath_common+0x74/0xac)
[<c010e9b8>] (warn_slowpath_common) from [<c010ea20>] (warn_slowpath_fmt+0x30/0x40)
[<c010ea20>] (warn_slowpath_fmt) from [<c012b1b4>] (__might_sleep+0x84/0xa0)
[<c012b1b4>] (__might_sleep) from [<c040fbb0>] (mutex_lock_nested+0x24/0x388)
[<c040fbb0>] (mutex_lock_nested) from [<c0319eb4>] (pccardd+0xf8/0x3fc)
[<c0319eb4>] (pccardd) from [<c0127370>] (kthread+0xdc/0xfc)
[<c0127370>] (kthread) from [<c01013a8>] (ret_from_fork+0x14/0x2c)
---[ end trace fd94911637eed4ba ]---
This happens due to kthread trying to lock mutex in a TASK_INTERRUPTIBLE
state. Limit TASK_INTERRUPTIBLE task state to the schedule() call only,
so that the rest of the code runs in TASK_RUNNING state.
Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/pcmcia/cs.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c index 5292db69c426..367d45e03bee 100644 --- a/drivers/pcmcia/cs.c +++ b/drivers/pcmcia/cs.c @@ -626,8 +626,6 @@ static int pccardd(void *__skt) unsigned int events; unsigned int sysfs_events; - set_current_state(TASK_INTERRUPTIBLE); - spin_lock_irqsave(&skt->thread_lock, flags); events = skt->thread_events; skt->thread_events = 0; @@ -675,11 +673,15 @@ static int pccardd(void *__skt) if (kthread_should_stop()) break; + set_current_state(TASK_INTERRUPTIBLE); + schedule(); + + /* make sure we are running */ + __set_current_state(TASK_RUNNING); + try_to_freeze(); } - /* make sure we are running before we exit */ - set_current_state(TASK_RUNNING); /* shut down socket, if a device is still present */ if (skt->state & SOCKET_PRESENT) { |