Kernel Oops after call to platform_driver_register | |
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Hello everyone,
I'm currently working on a framebuffer driver for a small graphic LCD
with a Sitronix ST7529 controller. I'm basing my code on
s1d13xxxfb.h and skeletonfb.h, and I'm getting a kernel Oops in the
call to platform_driver_register of my driver's initialization
routine. As can be seen in the output below, it seems that a null
pointer is being dereferenced in the call to strncmp in
platform_match. platform_match compares the device name, which is
initialized in my board configuration file, to the driver name,
initialized in the driver file. I can see that the device is
registered from the board file during the boot process because my
debug code is executing, but the driver fails to register when I
attempt to load the module with insmod. The relevant info from these
files is pasted below. Does anyone have an idea why I'm getting this
Oops or what I can do to track it down?
Many thanks in advance,
Alex
From st7529fb.h:
========================================================================
====
#define ST_FBID "ST7529"
#define ST_DEVICENAME "st7529fb"
struct st7529fb_regval {
u16 addr;
u8 value;
};
struct st7529fb_par {
void __iomem *regs;
unsigned char status;
#ifdef CONFIG_PM
void *regs_save; /* pm saves all registers here */
void *disp_save; /* pm saves entire screen here */
#endif
};
struct st7529fb_pdata {
const struct st7529fb_regval *initregs;
const unsigned int initregssize;
};
From st7529fb.c:
========================================================================
====
static struct platform_driver st7529fb_driver = {
.probe = st7529fb_probe,
.remove = st7529fb_remove,
#ifdef CONFIG_PM
.suspend = st7529fb_suspend, /* optional but recommended */
.resume = st7529fb_resume, /* optional but recommended */
.driver = {
.name = ST_DEVICENAME,
},#endif
};
static int __init st7529fb_init(void){
#ifndef MODULE
if (fb_get_options("st7529fb", NULL))
return -ENODEV;
#endif
dbg(PFX "initializing driver\n");
return platform_driver_register(&st7529fb_driver)
}
From board-at91sam9260ek.c
========================================================================
====
static struct st7529fb_pdata st7529fb_data = {
.initregssize = 0,
};
#define ST7529_FB_START 0x10400001 /* Stub address */
#define ST7529_FB_LEN 255*160
#define ST7529_REG_START 0x10400000
#define ST7529_REG_LEN 1
static struct resource st7529fb_resources[] = {
[0] = {
.start = ST7529_FB_START,
.end = ST7529_FB_START + ST7529_FB_LEN - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = ST7529_REG_START,
.end = ST7529_REG_START + ST7529_REG_LEN - 1,
.flags = IORESOURCE_MEM,
},
};
static struct platform_device st7529fb_device = {
.name = ST_DEVICENAME,
.id = 0,
.dev = {
.platform_data = &st7529fb_data,
},
.num_resources = ARRAY_SIZE(st7529fb_resources),
.resource = st7529fb_resources,
};
void __init at91_add_device_st7529(void)
{
printk("Registering ST7529 device\n");
platform_device_register(&st7529fb_device);
}
Oops output
========================================================================
====
# insmod st7529fb.ko
initializing ST7529 driver
Unable to handle kernel NULL pointer dereference at virtual address
00000000
pgd = c3670000
[00000000] *pgd=23c37031, *pte=00000000, *ppte=00000000
Internal error: Oops: 17 [#1]
Modules linked in: st7529fb
CPU: 0 Not tainted (2.6.24 #22)
PC is at strncmp+0x18/0x50
LR is at platform_match+0x1c/0x28
pc : [<c00e4444>] lr : [<c0118aec>] psr: 20000013
sp : c3debe10 ip : 00000073 fp : c3debe1c
r10: c485c000 r9 : 00000000 r8 : c02045ac
r7 : bf0008e4 r6 : bf0008e4 r5 : c01f76bc r4 : c01f76bc
r3 : 00000000 r2 : 00000013 r1 : 00000000 r0 : c01c56dc
Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 0005317f Table: 23670000 DAC: 00000015
Process insmod (pid: 275, stack limit = 0xc3dea258)
Stack: (0xc3debe10 to 0xc3dec000)
be00: c3debe2c c3debe20 c0118aec
c00e443c
be20: c3debe4c c3debe30 c0116fa4 c0118ae0 c01f7760 c01f76bc c01171f8
bf0008e4
be40: c3debe64 c3debe50 c011727c c0116f74 00000000 c3debe68 c3debe90
c3debe68
be60: c0116384 c0117208 c0204644 c0204644 c01f7704 bf0008e4 bf0008ec
00000000
be80: c485caf8 c3debea0 c3debe94 c0116e84 c011634c c3debec4 c3debea4
c0116734
bea0: c0116e74 bf0008e4 c3715e00 bf000b00 c485caf8 c485c800 c3debed8
c3debec8
bec0: c0117504 c01166d4 c3715f9c c3debee8 c3debedc c0118b7c c0117494
c3debef8
bee0: c3debeec bf00201c c0118b20 c3debfa4 c3debefc c0057574 bf002010
00000000
bf00: 00012008 00000000 00000000 00000000 00000000 00000000 00000000
00000000
bf20: 00000000 00000000 00000000 00000000 00000000 00000000 c485d040
c3761f80
bf40: c485caa8 c485c9e0 c485cad0 00000000 00000041 00000041 bf000b0c
00000013
bf60: c485c764 c485c800 00000013 00000011 00000014 00000000 00000000
4000098c
bf80: 00000004 00012018 00000080 c0020fa4 c3dea000 00012008 00000000
c3debfa8
bfa0: c0020e00 c0056244 4000098c 00000004 00012018 00001274 00012008
00000000
bfc0: 4000098c 00000004 00012018 00004000 be8d8ebb 00000002 00012008
00008cd0
bfe0: 4005f68c be8d8d38 00008f10 4005f698 20000010 00012018 00000000
00000000
Backtrace:[<c00e442c>] (strncmp+0x0/0x50) from [<c0118aec>]
(platform_match+0x1c/0x28)
[<c0118ad0>] (platform_match+0x0/0x28) from [<c0116fa4>]
(driver_probe_device+0x40/0x1b8)
[<c0116f64>] (driver_probe_device+0x0/0x1b8) from [<c011727c>]
(__driver_attach+0x84/0xe4) r7:bf0008e4 r6:c01171f8 r5:c01f76bc
r4:c01f7760
[<c01171f8>] (__driver_attach+0x0/0xe4) from [<c0116384>]
(bus_for_each_dev+0x48/0x80) r5:c3debe68 r4:00000000
[<c011633c>] (bus_for_each_dev+0x0/0x80) from [<c0116e84>]
(driver_attach+0x20/0x28) r7:c485caf8 r6:00000000 r5:bf0008ec
r4:bf0008e4
[<c0116e64>] (driver_attach+0x0/0x28) from [<c0116734>]
(bus_add_driver+0x70/0x1c0)
[<c01166c4>] (bus_add_driver+0x0/0x1c0) from [<c0117504>]
(driver_register+0x80/0x88) r8:c485c800 r7:c485caf8 r6:bf000b00
r5:c3715e00 r4:bf0008e4
[<c0117484>] (driver_register+0x0/0x88) from [<c0118b7c>]
(platform_driver_register+0x6c/0x88) r4:c3715f9c
[<c0118b10>] (platform_driver_register+0x0/0x88) from [<bf00201c>]
(st7529fb_init+0x1c/0x50 [st7529fb])
[<bf002000>] (st7529fb_init+0x0/0x50 [st7529fb]) from [<c0057574>]
(sys_init_module+0x1340/0x1428)
[<c0056234>] (sys_init_module+0x0/0x1428) from [<c0020e00>]
(ret_fast_syscall+0x0/0x2c)
Code: e24cb004 e3a03000 ea000008 e5d0c000 (e5d13000)
---[ end trace 5d724fd5d7a2bcb7 ]---
Segmentation fault
-------------------------------------------------------------------
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