1 files changed, 9 insertions, 6 deletions

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 78d616315d8e..5428d53f5a13 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -49,7 +49,7 @@ static int sg_version_num = 30534;	/* 2 digits for each component */
 #include <linux/blkdev.h>
 #include <linux/delay.h>
 #include <linux/blktrace_api.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>
 
 #include "scsi.h"
 #include <scsi/scsi_dbg.h>
@@ -103,6 +103,8 @@ static int scatter_elem_sz_prev = SG_SCATTER_SZ;
 static int sg_add(struct device *, struct class_interface *);
 static void sg_remove(struct device *, struct class_interface *);
 
+static DEFINE_MUTEX(sg_mutex);
+
 static DEFINE_IDR(sg_index_idr);
 static DEFINE_RWLOCK(sg_index_lock);    /* Also used to lock
                                                            file descriptor list for device */
@@ -229,7 +231,7 @@ sg_open(struct inode *inode, struct file *filp)
         int res;
         int retval;
 
-        lock_kernel();
+        mutex_lock(&sg_mutex);
         nonseekable_open(inode, filp);
         SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
         sdp = sg_get_dev(dev);
@@ -314,7 +316,7 @@ sdp_put:
 sg_put:
         if (sdp)
                 sg_put_dev(sdp);
-        unlock_kernel();
+        mutex_unlock(&sg_mutex);
         return retval;
 }
 
@@ -1092,9 +1094,9 @@ sg_unlocked_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg)
 {
         int ret;
 
-        lock_kernel();
+        mutex_lock(&sg_mutex);
         ret = sg_ioctl(filp, cmd_in, arg);
-        unlock_kernel();
+        mutex_unlock(&sg_mutex);
 
         return ret;
 }
@@ -1351,6 +1353,7 @@ static const struct file_operations sg_fops = {
         .mmap = sg_mmap,
         .release = sg_release,
         .fasync = sg_fasync,
+        .llseek = no_llseek,
 };
 
 static struct class *sg_sysfs_class;
@@ -1657,7 +1660,7 @@ static int sg_start_req(Sg_request *srp, unsigned char *cmd)
         if (sg_allow_dio && hp->flags & SG_FLAG_DIRECT_IO &&
             dxfer_dir != SG_DXFER_UNKNOWN && !iov_count &&
             !sfp->parentdp->device->host->unchecked_isa_dma &&
-            blk_rq_aligned(q, hp->dxferp, dxfer_len))
+            blk_rq_aligned(q, (unsigned long)hp->dxferp, dxfer_len))
                 md = NULL;
         else
                 md = &map_data;