[Devel] [PATCH RHEL10 COMMIT] drivers/vhost/blk: fix uninitialized variable

[Konstantin Khorenko]

The commit is pushed to "branch-rh10-6.12.0-211.16.1.12.x.vz10-ovz" and will appear at git at bitbucket.org:openvz/vzkernel.git
after rh10-6.12.0-211.16.1.12.4.vz10
------>
commit aea0a577cb1e67e9960da77b348b407571bde74f
Author: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
Date:   Fri Jun 19 16:33:07 2026 +0300

    drivers/vhost/blk: fix uninitialized variable
    
    Set ret to -EAGAIN. If we can't get backend, this means we are
    in the proccess of shutting down or suspending. The request will
    be read again from virtqueue some time later.
    
    https://virtuozzo.atlassian.net/browse/VSTOR-134034
    Signed-off-by: Andrey Zhadchenko <andrey.zhadchenko at virtuozzo.com>
    
    ======
    Patchset description:
    vhost-blk: handling of failing requests
    
    This series mainly addresses the handling of failing requests.
    Previously the driver will always retry all requests failed at
    processing and will always complete the requests if they are
    past bio submission point.
    
    Using vhost-net and vhost-scsi as a model, we adopt the following
    approach:
     - requests failed at processing phase with ENOMEM/EAGAIN are re-tried
     - requests failed at processing phase with other errors are not
    reported completed and are not processed further. It is higly likely
    they are just incorrect
     - requests failed at status write after the completion are not
    reported completed
    
    This may sometime lead to guests stalling, but the alternatives are
    always worse.
    
    Also the patchset improves logging and adds a few sanity checks.
    
    Feature: vhost-blk: in-kernel accelerator for virtio-blk guests
    Reviewed-by: Pavel Tikhomirov <ptikhomirov at virtuozzo.com>
---
 drivers/vhost/blk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vhost/blk.c b/drivers/vhost/blk.c
index a3f01d55865a7..e4236df2f2161 100644
--- a/drivers/vhost/blk.c
+++ b/drivers/vhost/blk.c
@@ -406,7 +406,7 @@ static int vhost_blk_req_submit(struct vhost_blk_req *req)
 {
 	struct block_device *bdev;
 	struct file *f;
-	int ret;
+	int ret = -EAGAIN;
 
 	note_request(req);