Hi Ben, I'm adding I2C support for SMDK6440 board. And observed a bootup crash while configuring GPIO GPR(); The following are the boot logs BUG: spinlock recursion on CPU#0, swapper/1 lock: c01fbd64, .magic: dead4ead, .owner: swapper/1, .owner_cpu: 0 [<c0023260>] (unwind_backtrace+0x0/0xec) from [<c011e764>] (do_raw_spin_lock+0x48/0x14c) [<c011e764>] (do_raw_spin_lock+0x48/0x14c) from [<c016e6e8>] (_raw_spin_lock_irqsave+0x10/0x18) [<c016e6e8>] (_raw_spin_lock_irqsave+0x10/0x18) from [<c00292e8>] (s5p6440_gpio_setcfg_4bit_rbank+0x54/0xb4) [<c00292e8>] (s5p6440_gpio_setcfg_4bit_rbank+0x54/0xb4) from [<c002a1bc>] (s3c_gpio_cfgpin+0x50/0x74) [<c002a1bc>] (s3c_gpio_cfgpin+0x50/0x74) from [<c0029478>] (s3c_i2c1_cfg_gpio+0x10/0x20) [<c0029478>] (s3c_i2c1_cfg_gpio+0x10/0x20) from [<c016af24>] (s3c24xx_i2c_probe+0x21c/0x5c8) [<c016af24>] (s3c24xx_i2c_probe+0x21c/0x5c8) from [<c01445ac>] (platform_drv_probe+0x18/0x1c) [<c01445ac>] (platform_drv_probe+0x18/0x1c) from [<c0143700>] (driver_probe_device+0xa8/0x158) [<c0143700>] (driver_probe_device+0xa8/0x158) from [<c0143810>] (__driver_attach+0x60/0x84) [<c0143810>] (__driver_attach+0x60/0x84) from [<c0142fa0>] (bus_for_each_dev+0x44/0x74) [<c0142fa0>] (bus_for_each_dev+0x44/0x74) from [<c01428a8>] (bus_add_driver+0x98/0x218) [<c01428a8>] (bus_add_driver+0x98/0x218) from [<c0143ae0>] (driver_register+0xa8/0x138) [<c0143ae0>] (driver_register+0xa8/0x138) from [<c001d388>] (do_one_initcall+0x58/0x1a8) [<c001d388>] (do_one_initcall+0x58/0x1a8) from [<c0008570>] (kernel_init+0x90/0x144) [<c0008570>] (kernel_init+0x90/0x144) from [<c001edf4>] (kernel_thread_exit+0x0/0x8) BUG: spinlock lockup on CPU#0, swapper/1, c01fbd64 [<c0023260>] (unwind_backtrace+0x0/0xec) from [<c011e82c>] (do_raw_spin_lock+0x110/0x14c) [<c011e82c>] (do_raw_spin_lock+0x110/0x14c) from [<c016e6e8>] (_raw_spin_lock_irqsave+0x10/0x18) [<c016e6e8>] (_raw_spin_lock_irqsave+0x10/0x18) from [<c00292e8>] (s5p6440_gpio_setcfg_4bit_rbank+0x54/0xb4) [<c00292e8>] (s5p6440_gpio_setcfg_4bit_rbank+0x54/0xb4) from [<c002a1bc>] (s3c_gpio_cfgpin+0x50/0x74) [<c002a1bc>] (s3c_gpio_cfgpin+0x50/0x74) from [<c0029478>] (s3c_i2c1_cfg_gpio+0x10/0x20) [<c0029478>] (s3c_i2c1_cfg_gpio+0x10/0x20) from [<c016af24>] (s3c24xx_i2c_probe+0x21c/0x5c8) [<c016af24>] (s3c24xx_i2c_probe+0x21c/0x5c8) from [<c01445ac>] (platform_drv_probe+0x18/0x1c) [<c01445ac>] (platform_drv_probe+0x18/0x1c) from [<c0143700>] (driver_probe_device+0xa8/0x158) [<c0143700>] (driver_probe_device+0xa8/0x158) from [<c0143810>] (__driver_attach+0x60/0x84) [<c0143810>] (__driver_attach+0x60/0x84) from [<c0142fa0>] (bus_for_each_dev+0x44/0x74) [<c0142fa0>] (bus_for_each_dev+0x44/0x74) from [<c01428a8>] (bus_add_driver+0x98/0x218) [<c01428a8>] (bus_add_driver+0x98/0x218) from [<c0143ae0>] (driver_register+0xa8/0x138) [<c0143ae0>] (driver_register+0xa8/0x138) from [<c001d388>] (do_one_initcall+0x58/0x1a8) [<c001d388>] (do_one_initcall+0x58/0x1a8) from [<c0008570>] (kernel_init+0x90/0x144) [<c0008570>] (kernel_init+0x90/0x144) from [<c001edf4>] (kernel_thread_exit+0x0/0x8) I found in the code that s3c_gpio_cfgpin() has a spinlock and it in turn calls s5p6440_gpio_setcfg_4bit_rbank() which has another spinlock with in. Should i be calling s5p6440_gpio_setcfg_4bit_rbank() directly when required to configure GPIO Bank R. Why there are special functions defined for GPIO Bank R only in S5P6440 and not in any other CPU. -- Shine bright, (: Naveen Krishna Ch :) -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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