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authorPatrick McManus <mcmanus@ducksong.com>2005-05-28 15:51:46 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-05-28 16:46:09 -0700
commit346e399b2a3a01b323fa74a0937e2d855479833b (patch)
treeb71ee6ae6ac00be7a932f578fbbd546d9df25b39
parentc1e4c8d3ee3300f363a52fd4cf3d90fdf5098f5a (diff)
[PATCH] intelfb section fix
On Nov 16 2004 a change to intelfbdrv.c was commited (as part of 0.9.2 it looks like) that added __initdata to all of the module param variables that seems to create the opportunity for an oops. I've recently been chasing an OOPS (http://marc.theaimsgroup.com/?l=linux-kernel&m=111552250920370&w=2) I created by reading every file on the /sys file system and I've traced it back to this code in the intelfbdrv. Though I had root privs in my initial problem report, it turns out they are un-necessary to generate the oops - all you've got to do is "cat /sys/module/intelfb/parameters/mode" enough times and eventually it will oops. This is because sysfs automatically exports all module_param declarations to the sysfs file system.. which means those variables can be dynamically evaluated at any later time, which of course means marking them __initdata is a bad idea ;).. when they happen to be char *'s it is an especially bad idea ;). Applying the patch below clears up the OOPS for me. Signed-off-by: Patrick McManus <mcmanus@ducksong.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/video/intelfb/intelfbdrv.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c
index 549e2293926..25f9a9a65c2 100644
--- a/drivers/video/intelfb/intelfbdrv.c
+++ b/drivers/video/intelfb/intelfbdrv.c
@@ -228,17 +228,17 @@ MODULE_DESCRIPTION(
MODULE_LICENSE("Dual BSD/GPL");
MODULE_DEVICE_TABLE(pci, intelfb_pci_table);
-static int accel __initdata = 1;
-static int vram __initdata = 4;
-static int hwcursor __initdata = 1;
-static int mtrr __initdata = 1;
-static int fixed __initdata = 0;
-static int noinit __initdata = 0;
-static int noregister __initdata = 0;
-static int probeonly __initdata = 0;
-static int idonly __initdata = 0;
-static int bailearly __initdata = 0;
-static char *mode __initdata = NULL;
+static int accel = 1;
+static int vram = 4;
+static int hwcursor = 1;
+static int mtrr = 1;
+static int fixed = 0;
+static int noinit = 0;
+static int noregister = 0;
+static int probeonly = 0;
+static int idonly = 0;
+static int bailearly = 0;
+static char *mode = NULL;
module_param(accel, bool, S_IRUGO);
MODULE_PARM_DESC(accel, "Enable console acceleration");