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jsflash: BKL pushdown 

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2008-05-20 19:16:08 +02:00 committed by Jonathan Corbet
parent cddf63d99d
commit 28fbbf4913
1 changed files with 10 additions and 3 deletions
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13
drivers/sbus/char/jsflash.c
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@ -27,6 +27,7 @@
*/
#include <linux/module.h>
#include <linux/smp_lock.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/miscdevice.h>
@ -417,11 +418,17 @@ static int jsf_mmap(struct file * file, struct vm_area_struct * vma)
static int jsf_open(struct inode * inode, struct file * filp)
{
if (jsf0.base == 0) return -ENXIO;
if (test_and_set_bit(0, (void *)&jsf0.busy) != 0)
lock_kernel();
if (jsf0.base == 0) {
unlock_kernel();
return -ENXIO;
}
if (test_and_set_bit(0, (void *)&jsf0.busy) != 0) {
unlock_kernel();
return -EBUSY;
}
unlock_kernel();
return 0; /* XXX What security? */
}