Drivers: scsi: storvsc: Implement a eh_timed_out handler

[pandora-kernel.git] / drivers / staging / hv / storvsc_drv.c

diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index 8960f1a..c43a9e8 100644 (file)
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/device.h>
 #include <linux/hyperv.h>
+#include <linux/blkdev.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_host.h>
@@ -1129,6 +1130,16 @@ static void storvsc_command_completion(struct hv_storvsc_request *request)
        kmem_cache_free(host_dev->request_pool, cmd_request);
 }
 
+/*
+ * The host guarantees to respond to each command, although I/O latencies might
+ * be unbounded on Azure.  Reset the timer unconditionally to give the host a
+ * chance to perform EH.
+ */
+static enum blk_eh_timer_return storvsc_eh_timed_out(struct scsi_cmnd *scmnd)
+{
+       return BLK_EH_RESET_TIMER;
+}
+
 static bool storvsc_check_scsi_cmd(struct scsi_cmnd *scmnd)
 {
        bool allowed = true;
@@ -1305,6 +1316,7 @@ static struct scsi_host_template scsi_driver = {
        .bios_param =           storvsc_get_chs,
        .queuecommand =         storvsc_queuecommand,
        .eh_host_reset_handler =        storvsc_host_reset_handler,
+       .eh_timed_out =         storvsc_eh_timed_out,
        .slave_alloc =          storvsc_device_alloc,
        .slave_configure =      storvsc_device_configure,
        .cmd_per_lun =          1,