@@ -1112,9 +1112,13 @@ int scsi_init_io(struct scsi_cmnd *cmd)
EXPORT_SYMBOL(scsi_init_io);
/**
- * scsi_initialize_rq - initialize struct scsi_cmnd.req
+ * scsi_initialize_rq - initialize struct scsi_cmnd partially
* @rq: Request associated with the SCSI command to be initialized.
*
+ * This function initializes the members of struct scsi_cmnd that must be
+ * initialized before request processing starts and that won't be
+ * reinitialized if a SCSI command is requeued.
+ *
* Called from inside blk_get_request() for pass-through requests and from
* inside scsi_init_command() for filesystem requests.
*/
@@ -1123,6 +1127,8 @@ void scsi_initialize_rq(struct request *rq)
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(rq);
scsi_req_init(&cmd->req);
+ cmd->jiffies_at_alloc = jiffies;
+ cmd->retries = 0;
}
EXPORT_SYMBOL(scsi_initialize_rq);
@@ -1162,6 +1168,8 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
void *prot = cmd->prot_sdb;
struct request *rq = blk_mq_rq_from_pdu(cmd);
unsigned int flags = cmd->flags & SCMD_PRESERVED_FLAGS;
+ unsigned long jiffies_at_alloc = cmd->jiffies_at_alloc;
+ int retries = cmd->retries;
if (!blk_rq_is_scsi(rq) && !(flags & SCMD_INITIALIZED)) {
flags |= SCMD_INITIALIZED;
@@ -1177,7 +1185,8 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd)
cmd->prot_sdb = prot;
cmd->flags = flags;
INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler);
- cmd->jiffies_at_alloc = jiffies;
+ cmd->jiffies_at_alloc = jiffies_at_alloc;
+ cmd->retries = retries;
scsi_add_cmd_to_list(cmd);
}
Requests are unprepared and reprepared when being requeued. Avoid that requeuing resets .jiffies_at_alloc and .retries by initializing these two member variables from inside scsi_initialize_rq() and by preserving both member variables when preparing a request. This patch affects the requeuing behavior of both the legacy scsi and the scsi-mq code paths. Reported-by: Brian King <brking@linux.vnet.ibm.com> References: https://lkml.org/lkml/2017/8/18/923 ("Re: [BUG][bisected 270065e] linux-next fails to boot on powerpc") Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Cc: Brian King <brking@linux.vnet.ibm.com> Cc: Hannes Reinecke <hare@suse.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> --- drivers/scsi/scsi_lib.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)