rtlwifi: Fix scheduling while atomic bug
authorLarry Finger <Larry.Finger@lwfinger.net>
Sat, 2 Feb 2013 21:55:00 +0000 (15:55 -0600)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 14 Feb 2013 18:48:50 +0000 (10:48 -0800)
commit5327297d3596654ca58e8a79ec38fa48c8f83fc0
tree38069151fd580b9c1b0136fbdfd8e046d5d80ac9
parent5f2ffd29fe0438dfb683a8f0ca0e451408e36970
rtlwifi: Fix scheduling while atomic bug

commit a5ffbe0a1993a27072742ef7db6cf9839956fce9 upstream.

Kernel commits 41affd5 and 6539306 changed the locking in rtl_lps_leave()
from a spinlock to a mutex by doing the calls indirectly from a work queue
to reduce the time that interrupts were disabled. This change was fine for
most systems; however a scheduling while atomic bug was reported in
https://bugzilla.redhat.com/show_bug.cgi?id=903881. The backtrace indicates
that routine rtl_is_special(), which calls rtl_lps_leave() in three places
was entered in atomic context. These direct calls are replaced by putting a
request on the appropriate work queue.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Reported-and-tested-by: Nathaniel Doherty <ntdoherty@gmail.com>
Cc: Nathaniel Doherty <ntdoherty@gmail.com>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/wireless/rtlwifi/base.c