From d3d328919f278eda489a482541583f79987ad0e2 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Fri, 19 Feb 2016 09:17:16 +0100 Subject: [PATCH] scsi_dh: add 'rescan' callback If a device needs to be rescanned the device_handler might need to be rechecked, too. So add a 'rescan' callback to the device handler and call it upon scsi_rescan_device(). The rescan callback will be invoked from the Unit Attention handling of ASC/ASCQ 3F 03 (INQUIRY DATA HAS CHANGED). Reviewed-by: Bart Van Assche Reviewed-by: Christoph Hellwig Signed-off-by: Hannes Reinecke Signed-off-by: Martin K. Petersen --- drivers/scsi/device_handler/scsi_dh_alua.c | 8 ++++++++ drivers/scsi/scsi_lib.c | 1 + drivers/scsi/scsi_scan.c | 8 +++++++- include/scsi/scsi_dh.h | 1 + 4 files changed, 17 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c index 3d8a254607e1..3d994aac2b85 100644 --- a/drivers/scsi/device_handler/scsi_dh_alua.c +++ b/drivers/scsi/device_handler/scsi_dh_alua.c @@ -1026,6 +1026,13 @@ static int alua_prep_fn(struct scsi_device *sdev, struct request *req) } +static void alua_rescan(struct scsi_device *sdev) +{ + struct alua_dh_data *h = sdev->handler_data; + + alua_initialize(sdev, h); +} + /* * alua_bus_attach - Attach device handler * @sdev: device to be attached to @@ -1086,6 +1093,7 @@ static struct scsi_device_handler alua_dh = { .prep_fn = alua_prep_fn, .check_sense = alua_check_sense, .activate = alua_activate, + .rescan = alua_rescan, .set_params = alua_set_params, }; diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index fa6b2c4eb7a2..d46193a5e246 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2699,6 +2699,7 @@ static void scsi_evt_emit(struct scsi_device *sdev, struct scsi_event *evt) envp[idx++] = "SDEV_MEDIA_CHANGE=1"; break; case SDEV_EVT_INQUIRY_CHANGE_REPORTED: + scsi_rescan_device(&sdev->sdev_gendev); envp[idx++] = "SDEV_UA=INQUIRY_DATA_HAS_CHANGED"; break; case SDEV_EVT_CAPACITY_CHANGE_REPORTED: diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 420239c2861c..97074c91e328 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -43,6 +43,7 @@ #include #include #include +#include #include #include "scsi_priv.h" @@ -1524,9 +1525,14 @@ EXPORT_SYMBOL(scsi_add_device); void scsi_rescan_device(struct device *dev) { + struct scsi_device *sdev = to_scsi_device(dev); + device_lock(dev); - scsi_attach_vpd(to_scsi_device(dev)); + scsi_attach_vpd(sdev); + + if (sdev->handler && sdev->handler->rescan) + sdev->handler->rescan(sdev); if (dev->driver && try_module_get(dev->driver->owner)) { struct scsi_driver *drv = to_scsi_driver(dev->driver); diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h index 7e184c6ebe5e..c7bba2b24849 100644 --- a/include/scsi/scsi_dh.h +++ b/include/scsi/scsi_dh.h @@ -71,6 +71,7 @@ struct scsi_device_handler { int (*activate)(struct scsi_device *, activate_complete, void *); int (*prep_fn)(struct scsi_device *, struct request *); int (*set_params)(struct scsi_device *, const char *); + void (*rescan)(struct scsi_device *); }; #ifdef CONFIG_SCSI_DH -- 2.20.1