diff options
| author | Jonathan Corbet <corbet@lwn.net> | 2008-05-15 16:08:15 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2008-06-20 14:05:49 -0600 |
| commit | b3369c68bf9d61062585f3ebc1286220191c0f84 (patch) | |
| tree | e2b5d3caeb4146eda621c109e16644edc9f0d54a | |
| parent | d4514d1bed1c7157bcff4c81307a9e0374df257a (diff) | |
st: cdev lock_kernel() pushdown
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
| -rw-r--r-- | drivers/scsi/st.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index e8db66ad0bd..e93544dd81b 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -38,6 +38,7 @@ static const char *verstr = "20080224"; #include <linux/cdev.h> #include <linux/delay.h> #include <linux/mutex.h> +#include <linux/smp_lock.h> #include <asm/uaccess.h> #include <asm/dma.h> @@ -1113,7 +1114,7 @@ static int check_tape(struct scsi_tape *STp, struct file *filp) } - /* Open the device. Needs to be called with BKL only because of incrementing the SCSI host + /* Open the device. Needs to take the BKL only because of incrementing the SCSI host module count. */ static int st_open(struct inode *inode, struct file *filp) { @@ -1123,6 +1124,7 @@ static int st_open(struct inode *inode, struct file *filp) int dev = TAPE_NR(inode); char *name; + lock_kernel(); /* * We really want to do nonseekable_open(inode, filp); here, but some * versions of tar incorrectly call lseek on tapes and bail out if that @@ -1130,8 +1132,10 @@ static int st_open(struct inode *inode, struct file *filp) */ filp->f_mode &= ~(FMODE_PREAD | FMODE_PWRITE); - if (!(STp = scsi_tape_get(dev))) + if (!(STp = scsi_tape_get(dev))) { + unlock_kernel(); return -ENXIO; + } write_lock(&st_dev_arr_lock); filp->private_data = STp; @@ -1140,6 +1144,7 @@ static int st_open(struct inode *inode, struct file *filp) if (STp->in_use) { write_unlock(&st_dev_arr_lock); scsi_tape_put(STp); + unlock_kernel(); DEB( printk(ST_DEB_MSG "%s: Device already in use.\n", name); ) return (-EBUSY); } @@ -1188,12 +1193,14 @@ static int st_open(struct inode *inode, struct file *filp) retval = (-EIO); goto err_out; } + unlock_kernel(); return 0; err_out: normalize_buffer(STp->buffer); STp->in_use = 0; scsi_tape_put(STp); + unlock_kernel(); return retval; } |