Commit ee524236 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

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: default avatarChristoph Hellwig <>
Reported-by: default avatarDexuan Cui <>
Tested-by: default avatarDexuan Cui <>
Reviewed-by: default avatarBart Van Assche <>
Signed-off-by: default avatarJens Axboe <>
parent 772c8f6f
......@@ -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;
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