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Message-Id: <1405183712-23967-5-git-send-email-kys@microsoft.com> Date: Sat, 12 Jul 2014 09:48:30 -0700 From: "K. Y. Srinivasan" <kys@...rosoft.com> To: jasowang@...hat.com, apw@...onical.com, linux-kernel@...r.kernel.org, devel@...uxdriverproject.org, ohering@...e.com, jbottomley@...allels.com, hch@...radead.org, linux-scsi@...r.kernel.org Cc: "K. Y. Srinivasan" <kys@...rosoft.com>, <stable@...r.kernel.org> Subject: [PATCH 5/7] Drivers: scsi: storvsc: Implement a timedout handler On Azure, we have seen instances of unbounded I/O latencies. To deal with this issue, implement handler that can reset the timeout. Note that the host gaurantees that it will respond to each command that has been issued. Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com> Cc: <stable@...r.kernel.org> --- drivers/scsi/storvsc_drv.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index 7e8a642..3516761 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -33,6 +33,7 @@ #include <linux/device.h> #include <linux/hyperv.h> #include <linux/mempool.h> +#include <linux/blkdev.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_host.h> @@ -1518,6 +1519,14 @@ static int storvsc_host_reset_handler(struct scsi_cmnd *scmnd) return SUCCESS; } +static enum blk_eh_timer_return storvsc_timeout_handler(struct scsi_cmnd *scmnd) +{ + /* + * The host will respond; ask for more time. + */ + return BLK_EH_RESET_TIMER; +} + static bool storvsc_scsi_cmd_ok(struct scsi_cmnd *scmnd) { bool allowed = true; @@ -1697,6 +1706,7 @@ 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_timeout_handler, .slave_alloc = storvsc_device_alloc, .slave_destroy = storvsc_device_destroy, .slave_configure = storvsc_device_configure, -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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