From: Patrick McManus Date: Sat, 28 May 2005 22:51:46 +0000 (-0700) Subject: [PATCH] intelfb section fix X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=346e399b2a3a01b323fa74a0937e2d855479833b;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [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 Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/video/intelfb/intelfbdrv.c b/drivers/video/intelfb/intelfbdrv.c index 549e22939260..25f9a9a65c24 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");