Messages in this thread Patch in this message | | | Date | Sat, 23 Jan 2016 15:12:43 +0100 | From | Willy Tarreau <> | Subject | [PATCH 2.6.32 22/42] ipmi: move timer init to before irq is setup |
| |
2.6.32-longterm review patch. If anyone has any objections, please let me know.
------------------
From: Jan Stancek <jstancek@redhat.com>
commit 27f972d3e00b50639deb4cc1392afaeb08d3cecc upstream.
We encountered a panic on boot in ipmi_si on a dell per320 due to an uninitialized timer as follows.
static int smi_start_processing(void *send_info, ipmi_smi_t intf) { /* Try to claim any interrupts. */ if (new_smi->irq_setup) new_smi->irq_setup(new_smi);
--> IRQ arrives here and irq handler tries to modify uninitialized timer
which triggers BUG_ON(!timer->function) in __mod_timer().
Call Trace: <IRQ> [<ffffffffa0532617>] start_new_msg+0x47/0x80 [ipmi_si] [<ffffffffa053269e>] start_check_enables+0x4e/0x60 [ipmi_si] [<ffffffffa0532bd8>] smi_event_handler+0x1e8/0x640 [ipmi_si] [<ffffffff810f5584>] ? __rcu_process_callbacks+0x54/0x350 [<ffffffffa053327c>] si_irq_handler+0x3c/0x60 [ipmi_si] [<ffffffff810efaf0>] handle_IRQ_event+0x60/0x170 [<ffffffff810f245e>] handle_edge_irq+0xde/0x180 [<ffffffff8100fc59>] handle_irq+0x49/0xa0 [<ffffffff8154643c>] do_IRQ+0x6c/0xf0 [<ffffffff8100ba53>] ret_from_intr+0x0/0x11
/* Set up the timer that drives the interface. */ setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
The following patch fixes the problem.
To: Openipmi-developer@lists.sourceforge.net To: Corey Minyard <minyard@acm.org> CC: linux-kernel@vger.kernel.org
Signed-off-by: Jan Stancek <jstancek@redhat.com> Signed-off-by: Tony Camuso <tcamuso@redhat.com> Signed-off-by: Corey Minyard <cminyard@mvista.com> [bwh: Backported to 3.2: adjust context] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> (cherry picked from commit 207ffa8cbcf6e780d862316a94c95a7e70d1e72e) Signed-off-by: Willy Tarreau <w@1wt.eu> --- drivers/char/ipmi/ipmi_si_intf.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c index abae8c9..f502f6d 100644 --- a/drivers/char/ipmi/ipmi_si_intf.c +++ b/drivers/char/ipmi/ipmi_si_intf.c @@ -1066,15 +1066,15 @@ static int smi_start_processing(void *send_info, new_smi->intf = intf; - /* Try to claim any interrupts. */ - if (new_smi->irq_setup) - new_smi->irq_setup(new_smi); - /* Set up the timer that drives the interface. */ setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi); new_smi->last_timeout_jiffies = jiffies; mod_timer(&new_smi->si_timer, jiffies + SI_TIMEOUT_JIFFIES); + /* Try to claim any interrupts. */ + if (new_smi->irq_setup) + new_smi->irq_setup(new_smi); + /* * Check if the user forcefully enabled the daemon. */ -- 1.7.12.2.21.g234cd45.dirty
| |