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authorJonathan Corbet <corbet@lwn.net>2008-05-15 12:22:06 -0600
committerJonathan Corbet <corbet@lwn.net>2008-06-20 14:05:49 -0600
commiteb09d3d4ee09b25876db549b6d5221610216e105 (patch)
tree6ae407c664fee1be448f03db2d75bafb9941e13a /drivers/scsi/sg.c
parent04f4ac9d1bb8a9103609ce8e927f8e98826ce339 (diff)
sg: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/scsi/sg.c')
-rw-r--r--drivers/scsi/sg.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index c9d7f721b9e..4284625ed03 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -49,6 +49,7 @@ static int sg_version_num = 30534; /* 2 digits for each component */
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/blktrace_api.h>
+#include <linux/smp_lock.h>
#include "scsi.h"
#include <scsi/scsi_dbg.h>
@@ -227,19 +228,26 @@ sg_open(struct inode *inode, struct file *filp)
int res;
int retval;
+ lock_kernel();
nonseekable_open(inode, filp);
SCSI_LOG_TIMEOUT(3, printk("sg_open: dev=%d, flags=0x%x\n", dev, flags));
sdp = sg_get_dev(dev);
- if ((!sdp) || (!sdp->device))
+ if ((!sdp) || (!sdp->device)) {
+ unlock_kernel();
return -ENXIO;
- if (sdp->detached)
+ }
+ if (sdp->detached) {
+ unlock_kernel();
return -ENODEV;
+ }
/* This driver's module count bumped by fops_get in <linux/fs.h> */
/* Prevent the device driver from vanishing while we sleep */
retval = scsi_device_get(sdp->device);
- if (retval)
+ if (retval) {
+ unlock_kernel();
return retval;
+ }
if (!((flags & O_NONBLOCK) ||
scsi_block_when_processing_errors(sdp->device))) {
@@ -295,10 +303,12 @@ sg_open(struct inode *inode, struct file *filp)
retval = -ENOMEM;
goto error_out;
}
+ unlock_kernel();
return 0;
error_out:
scsi_device_put(sdp->device);
+ unlock_kernel();
return retval;
}