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Stanislaw Gruszka 34a35bddb9 atmel_lcdfb: fix oops in rmmod when framebuffer fails to register 
If framebuffer registration failed in platform driver ->probe() callback,
dev_get_drvdata() points to freed memory region, but ->remove() function
try to use it and the following oops occurs:

Unable to handle kernel NULL pointer dereference at virtual address 00000228
pgd = c3a20000
[00000228] *pgd=23a2b031, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1]
Modules linked in: atmel_lcdfb(-) cfbcopyarea cfbimgblt cfbfillrect [last unloaded: atmel_lcdfb]
CPU: 0    Not tainted  (2.6.27-rc2 #116)
PC is at atmel_lcdfb_remove+0x14/0xf8 [atmel_lcdfb]
LR is at platform_drv_remove+0x20/0x24
pc : [<bf006bc4>]    lr : [<c0157d28>]    psr: a0000013
sp : c3a45e84  ip : c3a45ea0  fp : c3a45e9c
r10: 00000002  r9 : c3a44000  r8 : c0026c04
r7 : 00000880  r6 : c02bb228  r5 : 00000000  r4 : c02bb230
r3 : bf007e3c  r2 : c02bb230  r1 : 00000004  r0 : c02bb228
Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
Control: 0005317f  Table: 23a20000  DAC: 00000015
Process rmmod (pid: 6799, stack limit = 0xc3a44260)
Stack: (0xc3a45e84 to 0xc3a46000)
5e80:          c02bb230 bf007e3c bf007e3c c3a45eac c3a45ea0 c0157d28 bf006bc0
5ea0: c3a45ec4 c3a45eb0 c0156d20 c0157d18 c02bb230 c02bb2d8 c3a45ee0 c3a45ec8
5ec0: c0156da8 c0156cb8 bf007e3c bf007ee0 c02c8e14 c3a45efc c3a45ee4 c0156018
5ee0: c0156d50 bf007e3c bf007ee0 00000000 c3a45f18 c3a45f00 c0157220 c0155f9c
5f00: 00000000 bf007ee0 bf008000 c3a45f28 c3a45f1c c0157e34 c01571ec c3a45f38
5f20: c3a45f2c bf006ba8 c0157e30 c3a45fa4 c3a45f3c c005772c bf006ba4 656d7461
5f40: 636c5f6c 00626664 c004c988 c3a45f80 c3a45f5c 00000000 c3a45fb0 00000000
5f60: ffffffff becaccd8 00000880 00000000 000a5e80 00000001 bf007ee0 00000880
5f80: c3a45f84 00000000 becaccd4 00000002 000003df 00000081 00000000 c3a45fa8
5fa0: c0026a60 c0057584 00000002 000003df 00900081 000a5e80 00000880 00000000
5fc0: becaccd4 00000002 000003df 00000000 000a5e80 00000001 00000002 0000005f
5fe0: 4004f5ec becacbe8 0001a158 4004f5fc 20000010 00900081 f9ffbadf 7bbfb2bb
Backtrace:
[<bf006bb0>] (atmel_lcdfb_remove+0x0/0xf8 [atmel_lcdfb]) from [<c0157d28>] (platform_drv_remove+0x20/0x24)
 r6:bf007e3c r5:bf007e3c r4:c02bb230
[<c0157d08>] (platform_drv_remove+0x0/0x24) from [<c0156d20>] (__device_release_driver+0x78/0x98)
[<c0156ca8>] (__device_release_driver+0x0/0x98) from [<c0156da8>] (driver_detach+0x68/0x90)
 r5:c02bb2d8 r4:c02bb230
[<c0156d40>] (driver_detach+0x0/0x90) from [<c0156018>] (bus_remove_driver+0x8c/0xb4)
 r6:c02c8e14 r5:bf007ee0 r4:bf007e3c
[<c0155f8c>] (bus_remove_driver+0x0/0xb4) from [<c0157220>] (driver_unregister+0x44/0x48)
 r6:00000000 r5:bf007ee0 r4:bf007e3c
[<c01571dc>] (driver_unregister+0x0/0x48) from [<c0157e34>] (platform_driver_unregister+0x14/0x18)
 r6:bf008000 r5:bf007ee0 r4:00000000
[<c0157e20>] (platform_driver_unregister+0x0/0x18) from [<bf006ba8>] (atmel_lcdfb_exit+0x14/0x1c [atmel_lcdfb])
[<bf006b94>] (atmel_lcdfb_exit+0x0/0x1c [atmel_lcdfb]) from [<c005772c>] (sys_delete_module+0x1b8/0x22c)
[<c0057574>] (sys_delete_module+0x0/0x22c) from [<c0026a60>] (ret_fast_syscall+0x0/0x2c)
 r7:00000081 r6:000003df r5:00000002 r4:becaccd4
Code: e92dd870 e24cb004 e59050c4 e1a06000 (e5954228)
---[ end trace 85476b184d9e68d8 ]---

This patch fixes the oops.

Signed-off-by: Stanislaw Gruszka <stf_xl@wp.pl>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2008-09-05 14:39:38 -07:00
..
aty radeonfb: fix accel engine hangs 2008-08-12 16:07:28 -07:00
backlight [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
console fbcon: prevent cursor disappearance after switching to 512 character font 2008-08-12 16:07:29 -07:00
display fbdev: fix race in device_create 2008-05-20 13:31:53 -07:00
geode lxfb: fix console blanking 2008-07-24 10:47:40 -07:00
i810 i810fb: fix console switch regression 2008-03-19 18:53:36 -07:00
intelfb i2c: Let framebuffer drivers set their I2C bus class to DDC 2008-07-14 22:38:28 +02:00
kyro fbdev: change asm/uaccess.h to linux/uaccess.h 2007-10-16 09:43:17 -07:00
logo video/logo: add support for Blackfin/Linux logo for framebuffer console 2008-05-14 19:11:14 -07:00
matrox matrox maven: convert to a new-style i2c driver 2008-08-12 16:07:29 -07:00
mbx mbxfb: fix incorrect argument type 2008-03-10 18:01:20 -07:00
nvidia video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
omap [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
pnx4008 [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
riva video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
savage savagefb: speed up the I2C bus 2008-04-28 08:58:38 -07:00
sis video/sis/: remove compat code 2008-07-24 10:47:37 -07:00
vermilion removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
68328fb.c
…
Kconfig video: sh7760fb: SH7760/SH7763 LCDC framebuffer driver 2008-07-24 10:47:41 -07:00
Makefile video: Kill off leaked CONFIG_FB_SH7343VOU reference. 2008-07-29 06:39:26 +09:00
acornfb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
acornfb.h
…
am200epd.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
amba-clcd.c
…
amifb.c drivers/video/amifb.c cleanups 2008-07-24 10:47:40 -07:00
arcfb.c fbdev: change asm/uaccess.h to linux/uaccess.h 2007-10-16 09:43:17 -07:00
arkfb.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
asiliantfb.c
…
atafb.c atafb: test virtual screen range before subtraction on unsigned 2008-07-24 10:47:37 -07:00
atafb.h
…
atafb_iplan2p2.c
…
atafb_iplan2p4.c
…
atafb_iplan2p8.c
…
atafb_mfb.c
…
atafb_utils.h
…
atmel_lcdfb.c atmel_lcdfb: fix oops in rmmod when framebuffer fails to register 2008-09-05 14:39:38 -07:00
au1100fb.c au1100fb: fix modpost warnings 2007-10-18 14:37:17 -07:00
au1100fb.h
…
au1200fb.c
…
au1200fb.h
…
bf54x-lq043fb.c Blackfin arch: move include/asm-blackfin header files to arch/blackfin 2008-08-27 10:51:02 +08:00
bfin-t350mcqb-fb.c lcd: add lcd_device to check_fb() entry in lcd_ops 2008-07-24 10:47:40 -07:00
bt431.h
…
bt455.h
…
bw2.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
c2p.c export c2p 2008-07-20 17:24:39 -07:00
c2p.h
…
carminefb.c fbdev: add the carmine FB driver 2008-07-24 10:47:34 -07:00
carminefb.h fbdev: add the carmine FB driver 2008-07-24 10:47:34 -07:00
carminefb_regs.h fbdev: add the carmine FB driver 2008-07-24 10:47:34 -07:00
cfbcopyarea.c fb: add support for foreign endianness 2008-04-28 08:58:35 -07:00
cfbfillrect.c fb: add support for foreign endianness 2008-04-28 08:58:35 -07:00
cfbimgblt.c video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
cg3.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
cg6.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
cg14.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
chipsfb.c PM: Introduce PM_EVENT_HIBERNATE callback state 2008-02-23 10:40:04 -08:00
cirrusfb.c cirrusfb: check_par fixes 2008-09-02 19:21:38 -07:00
clps711xfb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
cobalt_lcdfb.c fbdev: add new Cobalt LCD framebuffer driver 2008-07-24 10:47:40 -07:00
controlfb.c
…
controlfb.h
…
cyber2000fb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
cyber2000fb.h
…
cyblafb.c drivers/video/: Spelling fixes 2008-02-03 17:31:49 +02:00
dnfb.c m68k: dnfb doesnt check for Apollo 2008-05-18 13:28:49 -07:00
edid.h
…
efifb.c x86_64 EFI boot support: EFI frame buffer driver 2007-11-29 09:24:54 -08:00
epson1355fb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
fb_ddc.c i2c: Let framebuffer drivers set their I2C bus class to DDC 2008-07-14 22:38:28 +02:00
fb_defio.c fbdefio: add set_page_dirty handler to deferred IO FB 2008-08-20 15:40:32 -07:00
fb_draw.h fb: add support for foreign endianness 2008-04-28 08:58:35 -07:00
fb_notify.c
…
fb_sys_fops.c fbdev: change asm/uaccess.h to linux/uaccess.h 2007-10-16 09:43:17 -07:00
fbcmap.c fbdev: change asm/uaccess.h to linux/uaccess.h 2007-10-16 09:43:17 -07:00
fbcvt.c
…
fbmem.c fbdefio: add set_page_dirty handler to deferred IO FB 2008-08-20 15:40:32 -07:00
fbmon.c fbdev: width and height are unsigned 2008-07-24 10:47:39 -07:00
fbsysfs.c
…
ffb.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
fm2fb.c
…
fsl-diu-fb.c freescale DIU: bug fix: add sanity check for AOI position 2008-08-15 08:35:43 -07:00
fsl-diu-fb.h fbdev: powerpc: driver for Freescale 8610 and 5121 DIU 2008-04-28 08:58:40 -07:00
g364fb.c
…
gbefb.c gbefb: cmap FIFO timeout 2008-07-30 09:41:47 -07:00
gxt4500.c fbdev: use DIV_ROUND_UP or roundup 2008-04-28 08:58:35 -07:00
hecubafb.c fbdev: platforming hecubafb and n411 2008-04-28 08:58:41 -07:00
hgafb.c hgafb: convert to new platform driver API 2008-07-24 10:47:39 -07:00
hitfb.c video: Fix up hp6xx driver build regressions. 2008-07-30 02:16:12 +09:00
hpfb.c m68k: Return -ENODEV if no device is found 2008-05-18 13:28:50 -07:00
igafb.c drivers/video: add missing pci_dev_get 2008-02-06 10:41:16 -08:00
imacfb.c imacfb: remove reference to otherwise-unused, non-existent screen_info.imacpm_seg 2007-11-29 09:24:53 -08:00
imsttfb.c video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
imxfb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
imxfb.h
…
leo.c sparc: get leo framebuffer working 2008-06-10 14:13:09 -07:00
macfb.c make macfb_setup() static 2008-07-26 12:00:12 -07:00
macmodes.c
…
macmodes.h
…
maxinefb.c
…
metronomefb.c video: use get/put_unaligned_* helpers 2008-04-29 08:06:28 -07:00
modedb.c fbdev: export symbol fb_mode_option 2008-06-06 11:29:12 -07:00
n411.c fbdev: platforming hecubafb and n411 2008-04-28 08:58:41 -07:00
neofb.c neofb: drop the xtimings structure 2008-07-24 10:47:41 -07:00
offb.c fbdev: Teaches offb about palette on radeon r5xx/r6xx 2008-07-22 10:39:36 +10:00
output.c Convert from class_device to device for drivers/video 2007-10-12 14:51:04 -07:00
p9100.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
platinumfb.c platinumfb: Use linux/of_{device,platform}.h instead of asm 2008-06-09 13:46:38 +10:00
platinumfb.h
…
pm2fb.c pm2fb: free cmap memory on module remove 2008-08-20 15:40:31 -07:00
pm3fb.c video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
pmag-aa-fb.c fbcon: fix color generation for monochrome framebuffer 2008-02-06 10:41:18 -08:00
pmag-ba-fb.c drivers/video/pmag-ba-fb.c: improve diagnostics 2007-10-16 09:43:19 -07:00
pmagb-b-fb.c pmagb-b-fb: improve diagnostics 2007-10-16 09:43:20 -07:00
ps3fb.c powerpc/ps3: Add a sub-match id to ps3_system_bus 2008-07-22 10:39:33 +10:00
pvr2fb.c sh: More header path fixups for mach dir refactoring. 2008-07-29 22:10:01 +09:00
pxafb.c [ARM] pxafb: fix the warning of incorrect lccr when lcd_conn is specified 2008-08-16 16:39:16 +01:00
pxafb.h pxafb: convert ctrlr_sem in a mutex 2008-07-24 10:47:37 -07:00
q40fb.c
…
s1d13xxxfb.c drivers/video/s1d13xxxfb.c: fix build as module with dbg 2007-11-14 18:45:38 -08:00
s3c2410fb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
s3c2410fb.h S3C2410: clean out changelog header and tidy 2008-05-24 09:56:13 -07:00
s3fb.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
sa1100fb.c [ARM] Move include/asm-arm/arch-* to arch/arm/*/include/mach 2008-08-07 09:55:48 +01:00
sa1100fb.h sa1100fb: convert ctrlr_sem in a mutex 2008-07-24 10:47:37 -07:00
sbuslib.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
sbuslib.h sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
sgivwfb.c x86, VisWS: turn into generic arch, move definitions 2008-07-10 18:55:40 +02:00
sh7760fb.c sh7760fb: write colormap value to hardware 2008-07-28 16:30:21 -07:00
sh_mobile_lcdcfb.c video: export sh_mobile_lcdc panel size 2008-08-11 20:17:55 +09:00
skeletonfb.c skeletonfb: update to correct platform driver usage 2008-07-24 10:47:39 -07:00
sm501fb.c sm501: fixup allocation code to be 64bit resource compliant 2008-07-24 10:47:40 -07:00
sstfb.c video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
sticore.h video/console/stico{n,re}.c: make code static 2008-07-26 12:00:12 -07:00
stifb.c video/stifb.c: make 2 functions static 2008-07-26 12:00:12 -07:00
sunxvr500.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
sunxvr2500.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
svgalib.c svgalib: mode selection updates 2007-10-16 09:43:22 -07:00
syscopyarea.c fb: add support for foreign endianness 2008-04-28 08:58:35 -07:00
sysfillrect.c fb: add support for foreign endianness 2008-04-28 08:58:35 -07:00
sysimgblt.c video: replace remaining __FUNCTION__ occurrences 2008-04-28 08:58:42 -07:00
tcx.c sparc video: remove open boot prom code 2008-05-08 21:37:30 -07:00
tdfxfb.c tdfxfb: fix frame buffer name overrun 2008-09-02 19:21:39 -07:00
tgafb.c tgafb: remove a redundant non-mono test in mono imageblit 2007-10-16 09:43:23 -07:00
tridentfb.c tridentfb: remove warning message that cyblafb driver should be used 2008-07-24 10:47:36 -07:00
uvesafb.c uvesafb: change mode parameter to mode_option 2008-07-24 10:47:37 -07:00
valkyriefb.c
…
valkyriefb.h
…
vesafb.c
…
vfb.c vfb: only enable if explicitly requested when compiled in 2008-07-24 10:47:39 -07:00
vga16fb.c vga16fb: source code improvement 2008-07-24 10:47:38 -07:00
vgastate.c
…
vt8623fb.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00
w100fb.c w100fb: add 80 MHz modeline 2008-07-04 10:40:08 -07:00
w100fb.h
…
xen-fbfront.c xen pvfb: Dynamic mode support (screen resizing) 2008-05-27 10:11:36 +02:00
xilinxfb.c removed unused #include <linux/version.h>'s 2008-08-23 12:14:12 -07:00