block, scsi: Fix race between SPI domain validation and system suspend

Avoid that the following warning is reported when suspending a system
that is using the mptspi driver:

WARNING: CPU: 0 PID: 4187 at drivers/scsi/scsi_lib.c:2960 scsi_device_quiesce+0x20/0xb0
EIP: scsi_device_quiesce+0x20/0xb0
Call Trace:
 spi_dv_device+0x65/0x5f0 [scsi_transport_spi]
 mptspi_dv_device+0x4d/0x170 [mptspi]
 mptspi_dv_renegotiate_work+0x49/0xc0 [mptspi]
 process_one_work+0x190/0x2e0
 worker_thread+0x37/0x3f0
 kthread+0xcb/0x100
 ret_from_fork+0x19/0x24

Fixes: 3a0a529971ec (block, scsi: Make SCSI quiesce and resume work reliably)
Reported-by: Woody Suwalski <terraluna977@gmail.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
[ rjw : Subject ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 14 insertions, 2 deletions

diff --git a/drivers/scsi/scsi_transport_spi.c b/drivers/scsi/scsi_transport_spi.c
index 10ebb213ddb3..871ea582029e 100644
--- a/drivers/scsi/scsi_transport_spi.c
+++ b/drivers/scsi/scsi_transport_spi.c
@@ -26,6 +26,7 @@
 #include <linux/mutex.h>
 #include <linux/sysfs.h>
 #include <linux/slab.h>
+#include <linux/suspend.h>
 #include <scsi/scsi.h>
 #include "scsi_priv.h"
 #include <scsi/scsi_device.h>
@@ -1009,11 +1010,20 @@ spi_dv_device(struct scsi_device *sdev)
         u8 *buffer;
         const int len = SPI_MAX_ECHO_BUFFER_SIZE*2;
 
+        /*
+         * Because this function and the power management code both call
+         * scsi_device_quiesce(), it is not safe to perform domain validation
+         * while suspend or resume is in progress. Hence the
+         * lock/unlock_system_sleep() calls.
+         */
+        lock_system_sleep();
+
         if (unlikely(spi_dv_in_progress(starget)))
-                return;
+                goto unlock;
 
         if (unlikely(scsi_device_get(sdev)))
-                return;
+                goto unlock;
+
         spi_dv_in_progress(starget) = 1;
 
         buffer = kzalloc(len, GFP_KERNEL);
@@ -1049,6 +1059,8 @@ spi_dv_device(struct scsi_device *sdev)
  out_put:
         spi_dv_in_progress(starget) = 0;
         scsi_device_put(sdev);
+unlock:
+        unlock_system_sleep();
 }
 EXPORT_SYMBOL(spi_dv_device);