[PATCH] xen-blkfront: fix sector_size propagation to the block layer

[Christoph Hellwig]

Ensure that info->sector_size and info->physical_sector_size are set
before the call to blkif_set_queue_limits by doing away with the
local variables and arguments that propagate them.

Thanks to Marek Marczykowski-Górecki and Jürgen Groß for root causing
the issue.

Fixes: ba3f67c11638 ("xen-blkfront: atomically update queue limits")
Reported-by: Rusty Bird <rustyb...@net-c.com>
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/block/xen-blkfront.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c
index fa3a2ba525458b..59ce113b882a0e 100644
--- a/drivers/block/xen-blkfront.c
+++ b/drivers/block/xen-blkfront.c
@@ -1070,8 +1070,7 @@ static char *encode_disk_name(char *ptr, unsigned int n)
 }
 
 static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
-               struct blkfront_info *info, u16 sector_size,
-               unsigned int physical_sector_size)
+               struct blkfront_info *info)
 {
        struct queue_limits lim = {};
        struct gendisk *gd;
@@ -1165,8 +1164,6 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
 
        info->rq = gd->queue;
        info->gd = gd;
-       info->sector_size = sector_size;
-       info->physical_sector_size = physical_sector_size;
 
        xlvbd_flush(info);
 
@@ -2320,8 +2317,6 @@ static void blkfront_gather_backend_features(struct 
blkfront_info *info)
 static void blkfront_connect(struct blkfront_info *info)
 {
        unsigned long long sectors;
-       unsigned long sector_size;
-       unsigned int physical_sector_size;
        int err, i;
        struct blkfront_ring_info *rinfo;
 
@@ -2360,7 +2355,7 @@ static void blkfront_connect(struct blkfront_info *info)
        err = xenbus_gather(XBT_NIL, info->xbdev->otherend,
                            "sectors", "%llu", &sectors,
                            "info", "%u", &info->vdisk_info,
-                           "sector-size", "%lu", &sector_size,
+                           "sector-size", "%lu", &info->sector_size,
                            NULL);
        if (err) {
                xenbus_dev_fatal(info->xbdev, err,
@@ -2374,9 +2369,9 @@ static void blkfront_connect(struct blkfront_info *info)
         * provide this. Assume physical sector size to be the same as
         * sector_size in that case.
         */
-       physical_sector_size = xenbus_read_unsigned(info->xbdev->otherend,
+       info->physical_sector_size = xenbus_read_unsigned(info->xbdev->otherend,
                                                    "physical-sector-size",
-                                                   sector_size);
+                                                   info->sector_size);
        blkfront_gather_backend_features(info);
        for_each_rinfo(info, rinfo, i) {
                err = blkfront_setup_indirect(rinfo);
@@ -2388,8 +2383,7 @@ static void blkfront_connect(struct blkfront_info *info)
                }
        }
 
-       err = xlvbd_alloc_gendisk(sectors, info, sector_size,
-                                 physical_sector_size);
+       err = xlvbd_alloc_gendisk(sectors, info);
        if (err) {
                xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s",
                                 info->xbdev->otherend);
-- 
2.43.0