Thomas Petazzoni 582da6527d of: make of_update_property() usable earlier in the boot process ... Commit 75b57ecf9d ('of: Make device nodes kobjects so they show up in sysfs') has turned Device Tree nodes in kobjects and added a sysfs based representation for Device Tree nodes. Since the sysfs logic is only available after the execution of a core_initcall(), the patch took precautions in of_add_property() and of_remove_property() to not do any sysfs related manipulation early in the boot process. However, it forgot to do the same for of_update_property(), which if used early in the boot process (before core_initcalls have been called), tries to call sysfs_remove_bin_file(), and crashes: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at /home/thomas/projets/linux-2.6/fs/kernfs/dir.c:1216 kernfs_remove_by_name_ns+0x80/0x88() kernfs: can not remove '(null)', no directory Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.15.0-rc1-00127-g1d7e7b2-dirty #423 [<c0014910>] (unwind_backtrace) from [<c00110ec>] (show_stack+0x10/0x14) [<c00110ec>] (show_stack) from [<c04c84b8>] (dump_stack+0x84/0x94) [<c04c84b8>] (dump_stack) from [<c001d8c0>] (warn_slowpath_common+0x6c/0x88) [<c001d8c0>] (warn_slowpath_common) from [<c001d90c>] (warn_slowpath_fmt+0x30/0x40) [<c001d90c>] (warn_slowpath_fmt) from [<c0104468>] (kernfs_remove_by_name_ns+0x80/0x88) [<c0104468>] (kernfs_remove_by_name_ns) from [<c0394d98>] (of_update_property+0xc0/0xf0) [<c0394d98>] (of_update_property) from [<c0647248>] (mvebu_timer_and_clk_init+0xfc/0x194) [<c0647248>] (mvebu_timer_and_clk_init) from [<c0640934>] (start_kernel+0x218/0x350) [<c0640934>] (start_kernel) from [<00008070>] (0x8070) ---[ end trace 3406ff24bd97382e ]--- Unable to handle kernel NULL pointer dereference at virtual address 0000003c pgd = c0004000 [0000003c] *pgd=00000000 Internal error: Oops: 5 [#1] SMP ARM Modules linked in: CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 3.15.0-rc1-00127-g1d7e7b2-dirty #423 task: c10ad4d8 ti: c10a2000 task.ti: c10a2000 PC is at kernfs_find_ns+0x8/0xf0 LR is at kernfs_find_and_get_ns+0x30/0x48 pc : [<c0103834>] lr : [<c010394c>] psr: 600001d3 sp : c10a3f34 ip : 00000073 fp : 00000000 r10: 00000000 r9 : cfffc240 r8 : cfdf2980 r7 : cf812c00 r6 : 00000000 r5 : 00000000 r4 : c10b45e0 r3 : c10ad4d8 r2 : 00000000 r1 : cf812c00 r0 : 00000000 Flags: nZCv IRQs off FIQs off Mode SVC_32 ISA ARM Segment kernel Control: 10c53c7d Table: 0000404a DAC: 00000015 Process swapper/0 (pid: 0, stack limit = 0xc10a2240) Stack: (0xc10a3f34 to 0xc10a4000) 3f20: c10b45e0 00000000 00000000 3f40: cf812c00 c010394c 00000063 cf812c00 00000001 cf812c00 cfdf29ac c03932cc 3f60: 00000063 cf812bc0 cfdf29ac cf812c00 ffffffff c03943f8 cfdf2980 c0104468 3f80: cfdf2a04 cfdf2980 cf812bc0 c06634b0 c10aa3c0 c0394da4 c10f74dc cfdf2980 3fa0: cf812bc0 c0647248 c10aa3c0 ffffffff c10de940 c10aa3c0 ffffffff c0640934 3fc0: ffffffff ffffffff c06404ec 00000000 00000000 c06634b0 00000000 10c53c7d 3fe0: c10aa434 c06634ac c10ae4c8 0000406a 414fc091 00008070 00000000 00000000 [<c0103834>] (kernfs_find_ns) from [<00000001>] (0x1) Code: e5c89001 eaffffcf e92d40f0 e1a06002 (e1d023bc) ---[ end trace 3406ff24bd97382f ]--- Kernel panic - not syncing: Attempted to kill the idle task! ---[ end Kernel panic - not syncing: Attempted to kill the idle task! To fix this problem, we simply skip the sysfs related calls in of_update_property(), and rely on of_init() to fix up things when it will be called, exactly as is done in of_add_property() and of_remove_property(). Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Fixes: 75b57ecf9d ("of: Make device nodes kobjects so they show up in sysfs") Signed-off-by: Grant Likely <grant.likely@linaro.org>		2014-05-14 15:27:36 +01:00
..
testcase-data	of: selftest: add deferred probe interrupt test	2014-04-24 16:58:55 +01:00
Kconfig	Merge branch 'devicetree/next-reserved-mem' into devicetree/next	2014-03-19 15:01:53 +00:00
Makefile	drivers: of: add initialization code for dynamic reserved memory	2014-03-11 17:26:58 +00:00
address.c	Linux 3.14-rc5	2014-03-04 16:44:10 +08:00
base.c	of: make of_update_property() usable earlier in the boot process	2014-05-14 15:27:36 +01:00
device.c	platform: introduce OF style 'modalias' support for platform bus	2014-01-17 01:59:15 +01:00
fdt.c	of: Fix the section mismatch warnings.	2014-04-14 12:26:12 -05:00
irq.c	of/irq: do irq resolution in platform_get_irq	2014-04-24 21:40:22 +01:00
of_mdio.c	of_mdio: Allow the DT to specify the phy ID and avoid autoprobing	2014-03-20 17:10:28 -04:00
of_mtd.c	of_mtd: Add helpers to get ECC strength and ECC step size	2014-03-10 22:42:28 -07:00
of_net.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-04-02 20:53:45 -07:00
of_pci.c	of: implement pci_address_to_pio as weak function	2013-10-09 20:04:06 -05:00
of_pci_irq.c	Merge remote-tracking branch 'grant/devicetree/next' into for-next	2013-11-07 10:34:46 -06:00
of_private.h	of: Output devicetree alias names in uevent	2013-02-06 11:06:35 +00:00
of_reserved_mem.c	drivers: of: add support for custom reserved memory drivers	2014-03-11 17:27:12 +00:00
pdt.c	of: device_node kobject lifecycle fixes	2014-03-19 14:58:40 +00:00
platform.c	of/irq: do irq resolution in platform_get_irq	2014-04-24 21:40:22 +01:00
selftest.c	of: selftest: add deferred probe interrupt test	2014-04-24 16:58:55 +01:00