* [PATCH] ipmi/powernv: Fix minor locking bug
@ 2015-04-10 7:32 Alistair Popple
2015-04-10 11:47 ` [Openipmi-developer] " Corey Minyard
0 siblings, 1 reply; 2+ messages in thread
From: Alistair Popple @ 2015-04-10 7:32 UTC (permalink / raw)
To: openipmi-developer
Cc: Alistair Popple, linuxppc-dev, linux-kernel, minyard, jk
If ipmi_powernv_recv(...) is called without a current message it
prints a warning and returns. However it fails to release the message
lock causing the system to dead lock during any subsequent IPMI
operations.
This error path should never normally be taken unless there are bugs
elsewhere in the system.
Signed-off-by: Alistair Popple <alistair@popple.id.au>
---
drivers/char/ipmi/ipmi_powernv.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/char/ipmi/ipmi_powernv.c b/drivers/char/ipmi/ipmi_powernv.c
index b3a2224..9b409c0 100644
--- a/drivers/char/ipmi/ipmi_powernv.c
+++ b/drivers/char/ipmi/ipmi_powernv.c
@@ -126,6 +126,7 @@ static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
spin_lock_irqsave(&smi->msg_lock, flags);
if (!smi->cur_msg) {
+ spin_unlock_irqrestore(&smi->msg_lock, flags);
pr_warn("no current message?\n");
return 0;
}
--
1.8.3.2
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [Openipmi-developer] [PATCH] ipmi/powernv: Fix minor locking bug
2015-04-10 7:32 [PATCH] ipmi/powernv: Fix minor locking bug Alistair Popple
@ 2015-04-10 11:47 ` Corey Minyard
0 siblings, 0 replies; 2+ messages in thread
From: Corey Minyard @ 2015-04-10 11:47 UTC (permalink / raw)
To: Alistair Popple, openipmi-developer; +Cc: linuxppc-dev, linux-kernel, jk
I should have caught that one. Thanks.
-corey
On 04/10/2015 02:32 AM, Alistair Popple wrote:
> If ipmi_powernv_recv(...) is called without a current message it
> prints a warning and returns. However it fails to release the message
> lock causing the system to dead lock during any subsequent IPMI
> operations.
>
> This error path should never normally be taken unless there are bugs
> elsewhere in the system.
>
> Signed-off-by: Alistair Popple <alistair@popple.id.au>
> ---
> drivers/char/ipmi/ipmi_powernv.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/char/ipmi/ipmi_powernv.c b/drivers/char/ipmi/ipmi_powernv.c
> index b3a2224..9b409c0 100644
> --- a/drivers/char/ipmi/ipmi_powernv.c
> +++ b/drivers/char/ipmi/ipmi_powernv.c
> @@ -126,6 +126,7 @@ static int ipmi_powernv_recv(struct ipmi_smi_powernv *smi)
> spin_lock_irqsave(&smi->msg_lock, flags);
>
> if (!smi->cur_msg) {
> + spin_unlock_irqrestore(&smi->msg_lock, flags);
> pr_warn("no current message?\n");
> return 0;
> }
^ permalink raw reply [flat|nested] 2+ messages in thread
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2015-04-10 7:32 [PATCH] ipmi/powernv: Fix minor locking bug Alistair Popple
2015-04-10 11:47 ` [Openipmi-developer] " Corey Minyard
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