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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>
This commit is contained in:
Christoph Hellwig 2017-02-21 10:04:55 +01:00 committed by Jens Axboe
parent 772c8f6f3b
commit ee52423604
1 changed files with 1 additions and 1 deletions
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2
drivers/scsi/scsi_lib.c
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@ -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;