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authorRalf Baechle <ralf@linux-mips.org>2007-02-23 13:40:45 +0000
committerRalf Baechle <ralf@linux-mips.org>2007-02-26 23:06:06 +0000
commitc4c4018b04f9b7993e3800dc1f391ac8947764a5 (patch)
tree346c9a4aa9c46eee6df883f89553e43b9d7033fc /arch/mips/kernel/vpe.c
parentcbc841356702ccf4f16e760c84006ed3ddd4b1fd (diff)
downloadlinux-stericsson-c4c4018b04f9b7993e3800dc1f391ac8947764a5.tar.gz
[MIPS] RTLX, VPE: Make open actually atomic.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/vpe.c')
-rw-r--r--arch/mips/kernel/vpe.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 9aca871a307f..c9ee9d2d5856 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1079,6 +1079,7 @@ static int getcwd(char *buff, int size)
static int vpe_open(struct inode *inode, struct file *filp)
{
int minor, ret;
+ enum vpe_state state;
struct vpe *v;
struct vpe_notifications *not;
@@ -1093,7 +1094,8 @@ static int vpe_open(struct inode *inode, struct file *filp)
return -ENODEV;
}
- if (v->state != VPE_STATE_UNUSED) {
+ state = xchg(&v->state, VPE_STATE_INUSE);
+ if (state != VPE_STATE_UNUSED) {
dvpe();
printk(KERN_DEBUG "VPE loader: tc in use dumping regs\n");
@@ -1108,9 +1110,6 @@ static int vpe_open(struct inode *inode, struct file *filp)
cleanup_tc(get_tc(minor));
}
- // allocate it so when we get write ops we know it's expected.
- v->state = VPE_STATE_INUSE;
-
/* this of-course trashes what was there before... */
v->pbuffer = vmalloc(P_SIZE);
v->plen = P_SIZE;