diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2010-02-04 06:58:28 +0000 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-02-05 11:53:28 +0900 |
| commit | 2c940db250c1610d95ea5331dc819b8bd4db96ae (patch) | |
| tree | fc1e5338940c4562d6b0e9df9e1a5525407b95c3 /mm | |
| parent | 2717568e7c44fe7dc3f4f52ea823811cfeede2b5 (diff) | |
usb: r8a66597-hcd: Fix up spinlock recursion in root hub polling.
The current root hub polling code exhibits a spinlock recursion on the
private controller lock. r8a66597_root_hub_control() is called from
r8a66597_timer() which grabs the lock and disables IRQs. The following
chain emerges:
r8a66597_timer() <-- lock taken
r8a66597_root_hub_control()
r8a66597_check_syssts()
usb_hcd_poll_rh_status() <-- acquires the same lock
/* insert death here */
The entire chain requires IRQs to be disabled, so we just unlock and
relock around the call to usb_hcd_poll_rh_status() while leaving the
IRQ state unchanged.
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Acked-by: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions