ipmi: fix timeout calculation when bmc is disconnected

commit e21404dc0ac7ac971c1e36274b48bb460463f4e5 upstream.

Loading ipmi_si module while bmc is disconnected, we found the timeout
is longer than 5 secs.  Actually it takes about 3 mins and 20
secs.(HZ=250)

error message as below:
  Dec 12 19:08:59 linux kernel: IPMI BT: timeout in RD_WAIT [ ] 1 retries left
  Dec 12 19:08:59 linux kernel: BT: write 4 bytes seq=0x01 03 18 00 01
  [...]
  Dec 12 19:12:19 linux kernel: IPMI BT: timeout in RD_WAIT [ ]
  Dec 12 19:12:19 linux kernel: failed 2 retries, sending error response
  Dec 12 19:12:19 linux kernel: IPMI: BT reset (takes 5 secs)
  Dec 12 19:12:19 linux kernel: IPMI BT: flag reset [ ]

Function wait_for_msg_done() use schedule_timeout_uninterruptible(1) to
sleep 1 tick, so we should subtract jiffies_to_usecs(1) instead of 100
usecs from timeout.

Reported-by: Hu Shiyuan <hushiyuan@huawei.com>
Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index e5bdd1a2f54194eb20fc7e9f1fc0faad49d263ea..25ed69ffd8dd3bca0cc6713b35d3e287f125e01d 100644 (file)
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -2783,7 +2783,7 @@ static int wait_for_msg_done(struct smi_info *smi_info)
                    smi_result == SI_SM_CALL_WITH_TICK_DELAY) {
                        schedule_timeout_uninterruptible(1);
                        smi_result = smi_info->handlers->event(
-                               smi_info->si_sm, 100);
+                               smi_info->si_sm, jiffies_to_usecs(1));
                } else if (smi_result == SI_SM_CALL_WITHOUT_DELAY) {
                        smi_result = smi_info->handlers->event(
                                smi_info->si_sm, 0);