1 files changed, 17 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index b14dc02c3de..17914a346f7 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -32,6 +32,7 @@
 #include <linux/delay.h>
 #include <linux/kthread.h>
 #include <linux/spinlock.h>
+#include <linux/async.h>
 
 #include <scsi/scsi.h>
 #include <scsi/scsi_cmnd.h>
@@ -179,6 +180,8 @@ int scsi_complete_async_scans(void)
         spin_unlock(&async_scan_lock);
 
         kfree(data);
+        /* Synchronize async operations globally */
+        async_synchronize_full();
         return 0;
 }
 
@@ -216,7 +219,7 @@ static void scsi_unlock_floptical(struct scsi_device *sdev,
         scsi_cmd[4] = 0x2a;     /* size */
         scsi_cmd[5] = 0;
         scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL,
-                         SCSI_TIMEOUT, 3);
+                         SCSI_TIMEOUT, 3, NULL);
 }
 
 /**
@@ -573,6 +576,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 
         /* Each pass gets up to three chances to ignore Unit Attention */
         for (count = 0; count < 3; ++count) {
+                int resid;
+
                 memset(scsi_cmd, 0, 6);
                 scsi_cmd[0] = INQUIRY;
                 scsi_cmd[4] = (unsigned char) try_inquiry_len;
@@ -581,7 +586,8 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
 
                 result = scsi_execute_req(sdev,  scsi_cmd, DMA_FROM_DEVICE,
                                           inq_result, try_inquiry_len, &sshdr,
-                                          HZ / 2 + HZ * scsi_inq_timeout, 3);
+                                          HZ / 2 + HZ * scsi_inq_timeout, 3,
+                                          &resid);
 
                 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s "
                                 "with code 0x%x\n",
@@ -602,6 +608,14 @@ static int scsi_probe_lun(struct scsi_device *sdev, unsigned char *inq_result,
                                     (sshdr.ascq == 0))
                                         continue;
                         }
+                } else {
+                        /*
+                         * if nothing was transferred, we try
+                         * again. It's a workaround for some USB
+                         * devices.
+                         */
+                        if (resid == try_inquiry_len)
+                                continue;
                 }
                 break;
         }
@@ -1390,7 +1404,7 @@ static int scsi_report_lun_scan(struct scsi_target *starget, int bflags,
 
                 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE,
                                           lun_data, length, &sshdr,
-                                          SCSI_TIMEOUT + 4 * HZ, 3);
+                                          SCSI_TIMEOUT + 4 * HZ, 3, NULL);
 
                 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS"
                                 " %s (try %d) result 0x%x\n", result