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changer: BKL pushdown

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Add lock_kernel() calls to ch_open(), though the existing locking looks
adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2008-05-16 14:12:52 -06:00
parent dea3f665d6
commit b0061a0ec4
1 changed files with 4 additions and 0 deletions
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4
drivers/scsi/ch.c
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@ -22,6 +22,7 @@
#include <linux/chio.h> /* here are all the ioctls */
#include <linux/mutex.h>
#include <linux/idr.h>
#include <linux/smp_lock.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@ -571,16 +572,19 @@ ch_open(struct inode *inode, struct file *file)
scsi_changer *ch;
int minor = iminor(inode);
lock_kernel();
spin_lock(&ch_index_lock);
ch = idr_find(&ch_index_idr, minor);
if (NULL == ch || scsi_device_get(ch->device)) {
spin_unlock(&ch_index_lock);
unlock_kernel();
return -ENXIO;
}
spin_unlock(&ch_index_lock);
file->private_data = ch;
unlock_kernel();
return 0;
}