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authorDmitry Eremin-Solenikov <dbaryshkov@gmail.com>2015-03-30 14:33:45 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-05-24 22:24:35 +0300
commitd3046ba809ce4a3c34d605000cdce48c6ba54b6c (patch)
treece73eeaf680c8ca5366769e4abede7da008a6cb4
parent7879b1d94badb5c34fa777244091c2304191dddf (diff)
downloadlinux-d3046ba809ce4a3c34d605000cdce48c6ba54b6c.tar.xz
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.c10
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) {