Hi! Hmm. Looks like there's a lot of fun to be had with sysfs. Pavel pavel@n900:~$ uname -a Linux n900 4.16.0-rc4-59690-g7f84626-dirty #543 Thu Mar 8 19:53:30 CET 2018 armv7l GNU/Linux [ 306.402496] bq2415x: command Timer reset [ 312.761322] adp1653 2-0030: Read Addr:03 Val:00 ok [ 313.264129] Unable to handle kernel NULL pointer dereference at virtual address 00000 000 [ 313.272308] pgd = 01336620 [ 313.275146] [00000000] *pgd=800af831, *pte=00000000, *ppte=00000000 [ 313.281463] Internal error: Oops: 80000007 [#1] ARM [ 313.286376] Modules linked in: [ 313.289459] CPU: 0 PID: 3584 Comm: grep Tainted: G W 4.16.0-rc4-59690-g 7f84626-dirty #543 [ 313.298919] Hardware name: Nokia RX-51 board [ 313.303222] PC is at (null) [ 313.306213] LR is at iio_ev_state_show+0x38/0x54 [ 313.310852] pc : [<00000000>] lr : [<c05d69c0>] psr: a0000013 [ 313.317169] sp : c7b47e70 ip : c087bb24 fp : 00000001 [ 313.322418] r10: cb19e000 r9 : c0857220 r8 : 00001000 [ 313.327667] r7 : 00000fff r6 : cb711c80 r5 : cb19e000 r4 : 00000000 [ 313.334228] r3 : 00000001 r2 : 00000000 r1 : c087b4dc r0 : ce584800 [ 313.340789] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 313.347991] Control: 10c5387d Table: 87bec019 DAC: 00000051 [ 313.353759] Process grep (pid: 3584, stack limit = 0xc4e45eab) [ 313.359619] Stack: (0xc7b47e70 to 0xc7b48000) [ 313.364013] 7e60: c05d6988 cb711b00 ce585c00 c0450d68 [ 313.471038] [<c05d69c0>] (iio_ev_state_show) from [<c0450d68>] (dev_attr_show+0x1c/0x4c) [ 313.479187] [<c0450d68>] (dev_attr_show) from [<c023f934>] (sysfs_kf_seq_show+0x90/0x108) [ 313.487426] [<c023f934>] (sysfs_kf_seq_show) from [<c023e2f8>] (kernfs_seq_show+0x24/0x28) [ 313.495758] [<c023e2f8>] (kernfs_seq_show) from [<c01fc954>] (seq_read+0x1dc/0x500) [ 313.503479] [<c01fc954>] (seq_read) from [<c01d9f80>] (__vfs_read+0x2c/0x120) [ 313.510681] [<c01d9f80>] (__vfs_read) from [<c01da0fc>] (vfs_read+0x88/0x114) [ 313.517852] [<c01da0fc>] (vfs_read) from [<c01da584>] (SyS_read+0x40/0x8c) [ 313.524780] [<c01da584>] (SyS_read) from [<c0101000>] (ret_fast_syscall+0x0/0x54) [ 313.532318] Exception stack(0xc7b47fa8 to 0xc7b47ff0) [ 313.537414] 7fa0: 00035330 00042000 00000003 00042000 00008000 00008000 -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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