@@ -2510,6 +2510,43 @@ int scsi_error_handler(void *data)
return 0;
}
+/*
+ * Single LUN error handle
+ *
+ * @work_q: list of scsi commands need to recovery
+ * @done_q: list of scsi commands handled
+ *
+ * return: return 1 if all commands in work_q is recoveryed, else 0 is returned
+ */
+int scsi_sdev_eh(struct scsi_device *sdev,
+ struct list_head *work_q,
+ struct list_head *done_q)
+{
+ int ret = 0;
+ struct scsi_cmnd *scmd;
+
+ SCSI_LOG_ERROR_RECOVERY(2, sdev_printk(KERN_INFO, sdev,
+ "%s:luneh: checking sense\n", current->comm));
+ ret = scsi_eh_get_sense(work_q, done_q);
+ if (ret)
+ return ret;
+
+ SCSI_LOG_ERROR_RECOVERY(2, sdev_printk(KERN_INFO, sdev,
+ "%s:luneh: start unit\n", current->comm));
+ scmd = list_first_entry(work_q, struct scsi_cmnd, eh_entry);
+ ret = scsi_eh_sdev_stu(scmd, work_q, done_q);
+ if (ret)
+ return ret;
+
+ SCSI_LOG_ERROR_RECOVERY(2, sdev_printk(KERN_INFO, sdev,
+ "%s:luneh reset LUN\n", current->comm));
+ scmd = list_first_entry(work_q, struct scsi_cmnd, eh_entry);
+ ret = scsi_eh_sdev_reset(scmd, work_q, done_q);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(scsi_sdev_eh);
+
/*
* Function: scsi_report_bus_reset()
*
@@ -18,6 +18,8 @@ extern int scsi_block_when_processing_errors(struct scsi_device *);
extern bool scsi_command_normalize_sense(const struct scsi_cmnd *cmd,
struct scsi_sense_hdr *sshdr);
extern enum scsi_disposition scsi_check_sense(struct scsi_cmnd *);
+extern int scsi_sdev_eh(struct scsi_device *sdev, struct list_head *workq,
+ struct list_head *doneq);
static inline bool scsi_sense_is_deferred(const struct scsi_sense_hdr *sshdr)
{
Add helper scsi_sdev_eh() to handle scsi device's error command list, it would perform some steps which can be done with LUN's IO blocked, including check sense, start unit and reset lun. Signed-off-by: Wenchao Hao <haowenchao2@huawei.com> --- drivers/scsi/scsi_error.c | 37 +++++++++++++++++++++++++++++++++++++ include/scsi/scsi_eh.h | 2 ++ 2 files changed, 39 insertions(+)