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authorTejun Heo <htejun@gmail.com>2006-05-15 20:57:20 +0900
committerTejun Heo <htejun@gmail.com>2006-05-15 20:57:20 +0900
commitee7863bc68fa6ad6fe7cfcc0e5ebe9efe0c0664e (patch)
tree2ca442445403be0101abf0592df3c625633dd49d /include/scsi
parent89f48c4d67dd875cf2216d4402bf77eda41fbdd9 (diff)
downloadop-kernel-dev-ee7863bc68fa6ad6fe7cfcc0e5ebe9efe0c0664e.zip
op-kernel-dev-ee7863bc68fa6ad6fe7cfcc0e5ebe9efe0c0664e.tar.gz
[PATCH] SCSI: implement shost->host_eh_scheduled
libata needs to invoke EH without scmd. This patch adds shost->host_eh_scheduled to implement such behavior. Currently the only user of this feature is libata and no general interface is defined. This patch simply adds handling for host_eh_scheduled where needed and exports scsi_eh_wakeup() to modules. The rest is upto libata. This is the result of the following discussion. http://thread.gmane.org/gmane.linux.scsi/23853/focus=9760 In short, SCSI host is not supposed to know about exceptions unrelated to specific device or command. Such exceptions should be handled by transport layer proper. However, the distinction is not essential to ATA and libata is planning to depart from SCSI, so, for the time being, libata will be using SCSI EH to handle such exceptions. Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_eh.h1
-rw-r--r--include/scsi/scsi_host.h1
2 files changed, 2 insertions, 0 deletions
diff --git a/include/scsi/scsi_eh.h b/include/scsi/scsi_eh.h
index d160880..212c983 100644
--- a/include/scsi/scsi_eh.h
+++ b/include/scsi/scsi_eh.h
@@ -35,6 +35,7 @@ static inline int scsi_sense_valid(struct scsi_sense_hdr *sshdr)
}
+extern void scsi_eh_wakeup(struct Scsi_Host *shost);
extern void scsi_eh_finish_cmd(struct scsi_cmnd *scmd,
struct list_head *done_q);
extern void scsi_eh_flush_done_q(struct list_head *done_q);
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index de6ce54..a42efd6 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -472,6 +472,7 @@ struct Scsi_Host {
*/
unsigned int host_busy; /* commands actually active on low-level */
unsigned int host_failed; /* commands that failed. */
+ unsigned int host_eh_scheduled; /* EH scheduled without command */
unsigned short host_no; /* Used for IOCTL_GET_IDLUN, /proc/scsi et al. */
int resetting; /* if set, it means that last_reset is a valid value */
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