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authorHannes Reinecke <hare@suse.de>2013-10-23 12:51:21 +0400
committerJames Bottomley <JBottomley@Parallels.com>2013-10-25 15:17:59 +0400
commitb45620229dd67ff1daffa8adce57f37b37860f78 (patch)
tree22f8577437188e6699fa9d1f05841ea1f545a68f /drivers/scsi/hosts.c
parent6b1e5a45d4eaa75e28f2d170ea43ab8fc6dd34d8 (diff)
downloadlinux-b45620229dd67ff1daffa8adce57f37b37860f78.tar.xz
[SCSI] Add 'eh_deadline' to limit SCSI EH runtime
This patchs adds an 'eh_deadline' sysfs attribute to the scsi host which limits the overall runtime of the SCSI EH. The 'eh_deadline' value is stored in the now obsolete field 'resetting'. When a command is failed the start time of the EH is stored in 'last_reset'. If the overall runtime of the SCSI EH is longer than last_reset + eh_deadline, the EH is short-circuited and falls through to issue a host reset only. [jejb: add comments in Scsi_Host about new fields] Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/hosts.c')
-rw-r--r--drivers/scsi/hosts.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/hosts.c b/drivers/scsi/hosts.c
index df0c3c71ea43..f334859024c0 100644
--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -316,6 +316,12 @@ static void scsi_host_dev_release(struct device *dev)
kfree(shost);
}
+static unsigned int shost_eh_deadline;
+
+module_param_named(eh_deadline, shost_eh_deadline, uint, S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(eh_deadline,
+ "SCSI EH timeout in seconds (should be between 1 and 2^32-1)");
+
static struct device_type scsi_host_type = {
.name = "scsi_host",
.release = scsi_host_dev_release,
@@ -388,6 +394,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost->unchecked_isa_dma = sht->unchecked_isa_dma;
shost->use_clustering = sht->use_clustering;
shost->ordered_tag = sht->ordered_tag;
+ shost->eh_deadline = shost_eh_deadline * HZ;
if (sht->supported_mode == MODE_UNKNOWN)
/* means we didn't set it ... default to INITIATOR */