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Re: [PATCH v2 1/3] xen/events: Cleanup find_virq() return codes
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 26 Aug 2025 09:22:10 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
- Delivery-date: Tue, 26 Aug 2025 07:22:22 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 26.08.2025 02:55, Jason Andryuk wrote:
> rc is overwritten by the evtchn_status hypercall in each iteration, so
> the return value will be whatever the last iteration is.
Which may even be a false "success". Especially for that it feels like ...
> Change to an
> explicit -ENOENT for an un-found virq and return 0 on a successful
> match.
>
> Signed-off-by: Jason Andryuk <jason.andryuk@xxxxxxx>
... this also wants a Fixes: tag and perhaps a Cc: to stable@.
> --- a/drivers/xen/events/events_base.c
> +++ b/drivers/xen/events/events_base.c
> @@ -1318,7 +1318,7 @@ static int find_virq(unsigned int virq, unsigned int
> cpu, evtchn_port_t *evtchn)
> {
> struct evtchn_status status;
> evtchn_port_t port;
> - int rc = -ENOENT;
> + int rc;
Maybe best to also move this into the more narrow scope (loop body)?
Either way:
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> memset(&status, 0, sizeof(status));
Having this outside of the loop is a little odd, too: It makes assumptions
on the behavior of the hypervisor (like not altering the structure upon
error). Yet likely not something to deal with right here.
Jan
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