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authorChristoph Hellwig <hch@lst.de>2017-02-21 10:04:55 +0100
committerJens Axboe <axboe@fb.com>2017-02-21 20:51:54 +0100
commitee5242360424b9b967454e9183767323d10cf985 (patch)
tree2500c4a89cae0d5363fe930ffeb2ff14626babb2 /drivers/scsi/scsi_lib.c
parentMerge tag 'for-4.11/linus-merge-signed' of git://git.kernel.dk/linux-block (diff)
downloadlinux-ee5242360424b9b967454e9183767323d10cf985.tar.xz
linux-ee5242360424b9b967454e9183767323d10cf985.zip
scsi: zero per-cmd driver data before each I/O
Without this drivers that don't clear the state themselves can see off effects. For example Hyper-V VMs using the storvsc driver will often hang during boot due to uncleared Test Unit Ready failures. Fixes: e9c787e6 ("scsi: allocate scsi_cmnd structures as part of struct request") Signed-off-by: Christoph Hellwig <hch@lst.de> Reported-by: Dexuan Cui <decui@microsoft.com> Tested-by: Dexuan Cui <decui@microsoft.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r--drivers/scsi/scsi_lib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 912fbc3b4543..3e32dc954c3c 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1167,7 +1167,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
/* zero out the cmd, except for the embedded scsi_request */
memset((char *)cmd + sizeof(cmd->req), 0,
- sizeof(*cmd) - sizeof(cmd->req));
+ sizeof(*cmd) - sizeof(cmd->req) + dev->host->hostt->cmd_size);
cmd->device = dev;
cmd->sense_buffer = buf;