* [PATCH] xen/blkfront: fix bug in backported patch
@ 2021-12-23 10:53 Juergen Gross
2021-12-23 10:57 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Juergen Gross @ 2021-12-23 10:53 UTC (permalink / raw)
To: stable; +Cc: xen-devel, Juergen Gross
The backport of commit 8f5a695d99000fc ("xen/blkfront: don't take local
copy of a request from the ring page") to stable 4.4 kernel introduced
a bug when adding the needed blkif_ring_get_request() function, as
info->ring.req_prod_pvt was incremented twice now.
Fix that be deleting the now superfluous increments after calling that
function.
Signed-off-by: Juergen Gross <jgross@suse.com>
---
drivers/block/xen-blkfront.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index 1e44b7880200..ae2c47e99c88 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -493,8 +493,6 @@ static int blkif_queue_discard_req(struct request *req)
else
ring_req->u.discard.flag = 0;
- info->ring.req_prod_pvt++;
-
/* Copy the request to the ring page. */
*final_ring_req = *ring_req;
info->shadow[id].inflight = true;
@@ -711,8 +709,6 @@ static int blkif_queue_rw_req(struct request *req)
if (setup.segments)
kunmap_atomic(setup.segments);
- info->ring.req_prod_pvt++;
-
/* Copy request(s) to the ring page. */
*final_ring_req = *ring_req;
info->shadow[id].inflight = true;
--
2.26.2
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] xen/blkfront: fix bug in backported patch
2021-12-23 10:53 [PATCH] xen/blkfront: fix bug in backported patch Juergen Gross
@ 2021-12-23 10:57 ` Greg KH
2021-12-23 13:40 ` Juergen Gross
0 siblings, 1 reply; 4+ messages in thread
From: Greg KH @ 2021-12-23 10:57 UTC (permalink / raw)
To: Juergen Gross; +Cc: stable, xen-devel
On Thu, Dec 23, 2021 at 11:53:08AM +0100, Juergen Gross wrote:
> The backport of commit 8f5a695d99000fc ("xen/blkfront: don't take local
> copy of a request from the ring page") to stable 4.4 kernel introduced
> a bug when adding the needed blkif_ring_get_request() function, as
> info->ring.req_prod_pvt was incremented twice now.
>
> Fix that be deleting the now superfluous increments after calling that
> function.
>
> Signed-off-by: Juergen Gross <jgross@suse.com>
> ---
> drivers/block/xen-blkfront.c | 4 ----
> 1 file changed, 4 deletions(-)
So this is only needed in 4.4.y? No other backports were incorrect?
thanks,
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] xen/blkfront: fix bug in backported patch
2021-12-23 10:57 ` Greg KH
@ 2021-12-23 13:40 ` Juergen Gross
2021-12-27 12:43 ` Greg KH
0 siblings, 1 reply; 4+ messages in thread
From: Juergen Gross @ 2021-12-23 13:40 UTC (permalink / raw)
To: Greg KH; +Cc: stable, xen-devel
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On 23.12.21 11:57, Greg KH wrote:
> On Thu, Dec 23, 2021 at 11:53:08AM +0100, Juergen Gross wrote:
>> The backport of commit 8f5a695d99000fc ("xen/blkfront: don't take local
>> copy of a request from the ring page") to stable 4.4 kernel introduced
>> a bug when adding the needed blkif_ring_get_request() function, as
>> info->ring.req_prod_pvt was incremented twice now.
>>
>> Fix that be deleting the now superfluous increments after calling that
>> function.
>>
>> Signed-off-by: Juergen Gross <jgross@suse.com>
>> ---
>> drivers/block/xen-blkfront.c | 4 ----
>> 1 file changed, 4 deletions(-)
>
> So this is only needed in 4.4.y? No other backports were incorrect?
Yes. 4.4 only.
Juergen
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] xen/blkfront: fix bug in backported patch
2021-12-23 13:40 ` Juergen Gross
@ 2021-12-27 12:43 ` Greg KH
0 siblings, 0 replies; 4+ messages in thread
From: Greg KH @ 2021-12-27 12:43 UTC (permalink / raw)
To: Juergen Gross; +Cc: stable, xen-devel
On Thu, Dec 23, 2021 at 02:40:38PM +0100, Juergen Gross wrote:
> On 23.12.21 11:57, Greg KH wrote:
> > On Thu, Dec 23, 2021 at 11:53:08AM +0100, Juergen Gross wrote:
> > > The backport of commit 8f5a695d99000fc ("xen/blkfront: don't take local
> > > copy of a request from the ring page") to stable 4.4 kernel introduced
> > > a bug when adding the needed blkif_ring_get_request() function, as
> > > info->ring.req_prod_pvt was incremented twice now.
> > >
> > > Fix that be deleting the now superfluous increments after calling that
> > > function.
> > >
> > > Signed-off-by: Juergen Gross <jgross@suse.com>
> > > ---
> > > drivers/block/xen-blkfront.c | 4 ----
> > > 1 file changed, 4 deletions(-)
> >
> > So this is only needed in 4.4.y? No other backports were incorrect?
>
> Yes. 4.4 only.
Great, now queued up, thanks.
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2021-12-27 12:43 UTC | newest]
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2021-12-23 10:53 [PATCH] xen/blkfront: fix bug in backported patch Juergen Gross
2021-12-23 10:57 ` Greg KH
2021-12-23 13:40 ` Juergen Gross
2021-12-27 12:43 ` Greg KH
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