[SCSI] Allow error handling timeout to be specified

Introduce eh_timeout which can be used for error handling purposes. This
was previously hardcoded to 10 seconds in the SCSI error handling
code. However, for some fast-fail scenarios it is necessary to be able
to tune this as it can take several iterations (bus device, target, bus,
controller) before we give up.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

2 files changed, 6 insertions, 0 deletions

diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
index 66216c1acb48..4b87d99e7fa1 100644
--- a/include/scsi/scsi.h
+++ b/include/scsi/scsi.h
@@ -10,9 +10,14 @@
 
 #include <linux/types.h>
 #include <linux/scatterlist.h>
+#include <linux/kernel.h>
 
 struct scsi_cmnd;
 
+enum scsi_timeouts {
+        SCSI_DEFAULT_EH_TIMEOUT         = 10 * HZ,
+};
+
 /*
  * The maximum number of SG segments that we will put inside a
  * scatterlist (unless chaining is used). Should ideally fit inside a
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index cc645876d147..a44954c7cdc2 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -113,6 +113,7 @@ struct scsi_device {
                                  * scsi_devinfo.[hc]. For now used only to
                                  * pass settings from slave_alloc to scsi
                                  * core. */
+        unsigned int eh_timeout; /* Error handling timeout */
         unsigned writeable:1;
         unsigned removable:1;
         unsigned changed:1;     /* Data invalid due to media change */