I've not had time to debug yet, but thought I would pass on this information:
pxa270 cpu, kernel 2.6.27-rc6. Platform file contains:
static struct pxa2xx_spi_master pxa_ssp_master_info = {
.num_chipselect = 1,
};
static struct spi_board_info spi_board_info[] __initdata = {
{
.modalias = "spidev",
.max_speed_hz = 13000000,
.bus_num = 1,
.chip_select = 0,
},
};
.....
pxa2xx_set_spi_info(1, &pxa_ssp_master_info);
spi_register_board_info(spi_board_info, ARRAY_SIZE(spi_board_info));
spidev seems to work fine -- I see activity on the spi bus like I expect.
When I go to remove the spidev module I get:
Backtrace:
[<bf004000>] (spidev_remove+0x0/0x194 [spidev]) from [<c018f6ec>]
(spi_drv_remove+0x20/0x24)
r6:c2c28000 r5:bf005b78 r4:c2ef2800
[<c018f6cc>] (spi_drv_remove+0x0/0x24) from [<c0166ccc>]
(__device_release_driver+0x78/0x98)
[<c0166c54>] (__device_release_driver+0x0/0x98) from [<c0167190>]
(driver_detach+0xb4/0xe0)
r5:c2ef2800 r4:c2ef28ac
[<c01670dc>] (driver_detach+0x0/0xe0) from [<c0165f9c>]
(bus_remove_driver+0x90/0xb8)
r7:00000880 r6:c02d79cc r5:bf005c40 r4:bf005b78
[<c0165f0c>] (bus_remove_driver+0x0/0xb8) from [<c016722c>]
(driver_unregister+0x48/0x4c)
r6:00000000 r5:bf005c40 r4:bf005b78
[<c01671e4>] (driver_unregister+0x0/0x4c) from [<bf004df0>]
(spidev_exit+0x14/0x90 [spidev])
r6:bf005d60 r5:bf005c40 r4:00000000
[<bf004ddc>] (spidev_exit+0x0/0x90 [spidev]) from [<c005ea74>]
(sys_delete_module+0x1b8/0x22c)
[<c005e8bc>] (sys_delete_module+0x0/0x22c) from [<c0024d20>]
(ret_fast_syscall+0x0/0x2c)
r7:00000081 r6:bec10430 r5:bec10450 r4:00000000
Code: eb40ba04 e3a06000 e59f010c eb40d67d (e5856004)
---[ end trace 1f4c46b3904ee652 ]---
Instrumenting spidev_remove a bit:
static int spidev_remove(struct spi_device *spi)
{
struct spidev_data *spidev = spi_get_drvdata(spi);
/* make sure ops on existing fds can abort cleanly */
spin_lock_irq(&spidev->spi_lock);
spidev->spi = NULL; <<<<<< this line is crashing
spidev is NULL, thus the crash.
Have I set everything up correctly? I plan to debug later when I have
some time, but thought I would check now in case this can be easily
fixed or if I'm doing something wrong.
Thanks,
Cliff
--
=======================
Cliff Brake
http://bec-systems.com
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