| Message ID | 20170524003420.5381-26-bart.vanassche@sandisk.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 05/24/2017 02:34 AM, Bart Van Assche wrote: > Instead of clearing most of struct scsi_cmnd and reinitializing > it, rely on scsi_initialize_rq() for initialization of struct > scsi_cmnd. This patch fixes a bug, namely that it avoids that > jiffies_at_alloc gets overwritten if a request is requeued. > > Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> > Cc: Christoph Hellwig <hch@lst.de> > Cc: Hannes Reinecke <hare@suse.com> > --- > drivers/scsi/scsi_lib.c | 12 +----------- > 1 file changed, 1 insertion(+), 11 deletions(-) > > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c > index 4b24c45fa113..12fd2bb0fe9c 100644 > --- a/drivers/scsi/scsi_lib.c > +++ b/drivers/scsi/scsi_lib.c > @@ -1861,27 +1861,17 @@ static int scsi_mq_prep_fn(struct request *req) > struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); > struct scsi_device *sdev = req->q->queuedata; > struct Scsi_Host *shost = sdev->host; > - unsigned char *sense_buf = cmd->sense_buffer; > struct scatterlist *sg; > > - /* zero out the cmd, except for the embedded scsi_request */ > - memset((char *)cmd + sizeof(cmd->req), 0, > - sizeof(*cmd) - sizeof(cmd->req) + shost->hostt->cmd_size); > + memset(scsi_cmd_priv(cmd), 0, shost->hostt->cmd_size); > > req->special = cmd; > > cmd->request = req; > - cmd->device = sdev; > - cmd->sense_buffer = sense_buf; > > cmd->tag = req->tag; > - > cmd->prot_op = SCSI_PROT_NORMAL; > > - INIT_LIST_HEAD(&cmd->list); > - INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); > - cmd->jiffies_at_alloc = jiffies; > - > scsi_add_cmd_to_list(cmd); > > sg = (void *)cmd + sizeof(struct scsi_cmnd) + shost->hostt->cmd_size; > Reviewed-by: Hannes Reinecke <hare@suse.com> Cheers, Hannes
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 4b24c45fa113..12fd2bb0fe9c 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1861,27 +1861,17 @@ static int scsi_mq_prep_fn(struct request *req) struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); struct scsi_device *sdev = req->q->queuedata; struct Scsi_Host *shost = sdev->host; - unsigned char *sense_buf = cmd->sense_buffer; struct scatterlist *sg; - /* zero out the cmd, except for the embedded scsi_request */ - memset((char *)cmd + sizeof(cmd->req), 0, - sizeof(*cmd) - sizeof(cmd->req) + shost->hostt->cmd_size); + memset(scsi_cmd_priv(cmd), 0, shost->hostt->cmd_size); req->special = cmd; cmd->request = req; - cmd->device = sdev; - cmd->sense_buffer = sense_buf; cmd->tag = req->tag; - cmd->prot_op = SCSI_PROT_NORMAL; - INIT_LIST_HEAD(&cmd->list); - INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); - cmd->jiffies_at_alloc = jiffies; - scsi_add_cmd_to_list(cmd); sg = (void *)cmd + sizeof(struct scsi_cmnd) + shost->hostt->cmd_size;
Instead of clearing most of struct scsi_cmnd and reinitializing it, rely on scsi_initialize_rq() for initialization of struct scsi_cmnd. This patch fixes a bug, namely that it avoids that jiffies_at_alloc gets overwritten if a request is requeued. Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Hannes Reinecke <hare@suse.com> --- drivers/scsi/scsi_lib.c | 12 +----------- 1 file changed, 1 insertion(+), 11 deletions(-)