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authorJan Stancek <jstancek@redhat.com>2015-12-08 21:57:51 +0300
committerJiri Slaby <jslaby@suse.cz>2016-01-25 17:15:42 +0300
commite45713934b8ed19373443d74eb4ac4c0642b3e68 (patch)
treed23185cf36fd9033d369a6e237f181f5585f37d6 /drivers/char
parenta9166cbdee829d53723cf9324da0951ff9dd6802 (diff)
downloadlinux-e45713934b8ed19373443d74eb4ac4c0642b3e68.tar.xz
ipmi: move timer init to before irq is setup
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> Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/ipmi/ipmi_si_intf.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 25ed69ffd8dd..c16fd35bd640 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1152,14 +1152,14 @@ 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);
smi_mod_timer(new_smi, 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.
*/