Thank you; That makes sense. For reference the mcs5000 driver as well as an st1232 driver that was in the linux input patch stream perform I2C xfers in an interrupt context. On Tue, 2011-01-04 at 14:00 +0530, Hemanth V wrote: > ----- Original Message ----- > From: "David Lynch Jr." <dhlii@xxxxxxxxxx> > To: "Linux OMAP Mailing List" <linux-omap@xxxxxxxxxxxxxxx> > Cc: <linux-input@xxxxxxxxxxxxxxx>; <linux-i2c@xxxxxxxxxxxxxxx> > Sent: Tuesday, January 04, 2011 12:26 PM > Subject: I2C Touchscreen OMAP OOPS > > > >I am trying to get a vendor provided I2C touchscreen driver working with > > android froyo with a 2.6.32 linux kernel for a client. I have fixed alot > > of things and I am down to one serious problem remaining. > > > > The driver is oops'ing reading the touchscreen data in omap_i2c_xfer. > > I tried to figure out what was going on by printk tracing omap_i2c_xfer, > > but the problem goes away - mostly with a few judiciously inserted > > printk's > > > > I tried backporting the 2.6.37 i2c-omap code, but that does nto change > > behavior. > > > > What is "scheduling while atomic" ? and what am I trying to look for ? > > Is the root of this problem in the touchscreen driver ? omap_i2c or > > should I be looking elsewhere ? > > Looks like your touchscreen driver is trying to do i2c transfer in IRQ > context, > hence the error. > > > > > > > root@beagleboard:~# evtest /dev/input/event1 > > Input driver version is 1.0.0evdev.c(EVIOCGBIT): Suspicious buffer size > > 511, limiting output to 64 bytes. See > > http://userweb.kernel.org/~dtor/eviocgbit-bug.html > > > > Input device ID: bus 0x18 vendor 0xdead product 0x534 version 0x1 > > Input device name: "sitronix_ts" > > Supported events: > > Event type 0 (Sync) > > Event type 1 (Key) > > Event code 330 (Touch) > > Event type 3 (Absolute) > > Event code 0 (X) > > Value 0 > > Min 0 > > Max 480 > > Event code 1 (Y) > > Value 0 > > Min 0 > > Max 256 > > Testing ... (interrupt to exit) > > BUG: scheduling while atomic: swapper/0/0x00010003 > > Unable to handle kernel NULL pointer dereference at virtual address > > 00000000 > > pgd = c0004000 > > [00000000] *pgd=00000000 > > Internal error: Oops: 80000007 [#1] PREEMPT > > last sysfs > > file: > > /sys/devices/platform/mmci-omap-hs.0/mmc_host/mmc0/mmc0:aaaa/block/mmcblk0/size > > Modules linked in: > > CPU: 0 Not tainted (2.6.32 #98) > > PC is at 0x0 > > LR is at enqueue_task+0x28/0x34 > > pc : [<00000000>] lr : [<c005aaac>] psr: 20000193 > > sp : c04dbc30 ip : 00000016 fp : c04dbc44 > > r10: 00000000 r9 : 00000000 r8 : 00000002 > > r7 : 00000000 r6 : 00000000 r5 : c04e8cc8 r4 : c04dcfa8 > > r3 : 00000000 r2 : 00000001 r1 : c04dcfa8 r0 : c04e8cc8 > > Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel > > Control: 10c5387d Table: 8c8c8019 DAC: 00000017 > > > > LR: 0xc005aa2c: > > aa2c e8bd8800 e92d4800 e59100c4 e28db004 e3500002 03a0000c 13a00000 > > e8bd8800 > > aa4c e92d48f0 e1c040d0 e1a06002 e1a07003 e0566004 e0c77005 e28db014 > > e1a021a6 > > aa6c e1a031c7 e1822e87 e0944002 e0a55003 e1c040f0 e8bd88f0 e3520000 > > e92d48d8 > > aa8c e1a04001 e28db014 11c165d8 11c168f8 e5943028 e1a01004 e5933004 > > e12fff33 > > aaac e3a03001 e584304c e8bd88d8 e92d4b78 e2525000 e28db01c e1a06000 > > e1a04001 > > aacc 0a000010 e1c127d0 e1921003 0a000008 e1c485d8 e2840078 e0582002 > > e0c93003 > > aaec ebffffd6 e3a02000 e3a03000 e1c427f0 ea000004 e59f3030 e2840090 > > e5932000 > > ab0c e3a03000 ebffffcd e5943028 e1a00006 e1a01004 e1a02005 e5933008 > > e12fff33 > > > > SP: 0xc04dbbb0: > > bbb0 0000000f 00000010 00000000 30303033 00000031 00000000 00000000 > > 00000000 > > bbd0 00000000 ffffffff c04dbc1c 00000000 00000000 c0034bf0 c04e8cc8 > > c04dcfa8 > > bbf0 00000001 00000000 c04dcfa8 c04e8cc8 00000000 00000000 00000002 > > 00000000 > > bc10 00000000 c04dbc44 00000016 c04dbc30 c005aaac 00000000 20000193 > > ffffffff > > bc30 ffffffff c04e8cc8 00000000 c04da000 c04dbc54 c005ab70 00000000 > > c04dcfa8 > > bc50 c04dbc7c c005e9b8 c044d812 80000193 c05257f0 cf91e010 00000001 > > cf91e01c > > bc70 00000001 00000003 c04dbca4 c005aef0 00000000 00000113 00001004 > > 00000000 > > bc90 00000039 00000001 0000601f c04e92d4 c04dbcbc c005cf14 00000000 > > 35303135 > > > > FP: 0xc04dbbc4: > > bbc4 00000000 00000000 00000000 00000000 ffffffff c04dbc1c 00000000 > > 00000000 > > bbe4 c0034bf0 c04e8cc8 c04dcfa8 00000001 00000000 c04dcfa8 c04e8cc8 > > 00000000 > > bc04 00000000 00000002 00000000 00000000 c04dbc44 00000016 c04dbc30 > > c005aaac > > bc24 00000000 20000193 ffffffff ffffffff c04e8cc8 00000000 c04da000 > > c04dbc54 > > bc44 c005ab70 00000000 c04dcfa8 c04dbc7c c005e9b8 c044d812 80000193 > > c05257f0 > > bc64 cf91e010 00000001 cf91e01c 00000001 00000003 c04dbca4 c005aef0 > > 00000000 > > bc84 00000113 00001004 00000000 00000039 00000001 0000601f c04e92d4 > > c04dbcbc > > bca4 c005cf14 00000000 35303135 63303536 cf91e000 c04dbdec c024626c > > cf85bb00 > > > > R0: 0xc04e8c48: > > 8c48 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > 00000000 > > 8c68 00000000 00000000 00000000 00000000 000f4240 000f4240 000f4240 > > 004c4b40 > > 8c88 004c4b40 000f4240 0003d090 0003d090 00000001 c04e8c9c c04e8c9c > > 000f4240 > > 8ca8 000e7ef0 00000001 c04e8cb0 c04e8cb0 cc901b18 c0525278 00000004 > > 00000001 > > 8cc8 00000000 00000000 00000070 00000176 0000018b 0000013b 00000000 > > 00000000 > > 8ce8 00000000 0000268a 00009fd5 00000000 00000000 00000000 00000000 > > 00000000 > > 8d08 00000000 00000000 cd9c987c 00000008 00000000 00000000 c04e8d20 > > c04e8d20 > > 8d28 00000000 00000000 00000000 00000000 00000000 c04e8cc8 00000000 > > 00000000 > > > > R1: 0xc04dcf28: > > cf28 c01bf6e4 c037cf08 c01bf70c c037cf10 c01bf748 c037cf18 c01da958 > > c037cf20 > > cf48 c01da968 c037cf28 c02a4854 c037cf30 c02a4924 c037cf38 c02a4a84 > > c037cf40 > > cf68 c02a4bdc c037cf48 c02a4d00 c037cf50 c02a4dd0 c037cf58 c02a4f40 > > c037cf60 > > cf88 c02a50ac c037cf68 c02c74b0 c037cf70 c02c7a84 c037cf78 c02c7aa0 > > c037cf80 > > cfa8 00000002 c04da000 00000002 00200000 00000000 ffffffff 00000078 > > 00000078 > > cfc8 00000078 00000000 c037e5f0 00000000 00000400 00400000 00000000 > > 00000000 > > cfe8 00000000 c04dcfec c04dcfec 00000000 00000000 00000000 00000000 > > 00000000 > > d008 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > 00000000 > > > > R4: 0xc04dcf28: > > cf28 c01bf6e4 c037cf08 c01bf70c c037cf10 c01bf748 c037cf18 c01da958 > > c037cf20 > > cf48 c01da968 c037cf28 c02a4854 c037cf30 c02a4924 c037cf38 c02a4a84 > > c037cf40 > > cf68 c02a4bdc c037cf48 c02a4d00 c037cf50 c02a4dd0 c037cf58 c02a4f40 > > c037cf60 > > cf88 c02a50ac c037cf68 c02c74b0 c037cf70 c02c7a84 c037cf78 c02c7aa0 > > c037cf80 > > cfa8 00000002 c04da000 00000002 00200000 00000000 ffffffff 00000078 > > 00000078 > > cfc8 00000078 00000000 c037e5f0 00000000 00000400 00400000 00000000 > > 00000000 > > cfe8 00000000 c04dcfec c04dcfec 00000000 00000000 00000000 00000000 > > 00000000 > > d008 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > 00000000 > > > > R5: 0xc04e8c48: > > 8c48 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > > 00000000 > > 8c68 00000000 00000000 00000000 00000000 000f4240 000f4240 000f4240 > > 004c4b40 > > 8c88 004c4b40 000f4240 0003d090 0003d090 00000001 c04e8c9c c04e8c9c > > 000f4240 > > 8ca8 000e7ef0 00000001 c04e8cb0 c04e8cb0 cc901b18 c0525278 00000004 > > 00000001 > > 8cc8 00000000 00000000 00000070 00000176 0000018b 0000013b 00000000 > > 00000000 > > 8ce8 00000000 0000268a 00009fd5 00000000 00000000 00000000 00000000 > > 00000000 > > 8d08 00000000 00000000 cd9c987c 00000008 00000000 00000000 c04e8d20 > > c04e8d20 > > 8d28 00000000 00000000 00000000 00000000 00000000 c04e8cc8 00000000 > > 00000000 > > Process swapper (pid: 0, stack limit = 0xc04da2e8) > > Stack: (0xc04dbc30 to 0xc04dc000) > > bc20: ffffffff c04e8cc8 00000000 > > c04da000 > > bc40: c04dbc54 c005ab70 00000000 c04dcfa8 c04dbc7c c005e9b8 c044d812 > > 80000193 > > bc60: c05257f0 cf91e010 00000001 cf91e01c 00000001 00000003 c04dbca4 > > c005aef0 > > bc80: 00000000 00000113 00001004 00000000 00000039 00000001 0000601f > > c04e92d4 > > bca0: c04dbcbc c005cf14 00000000 35303135 63303536 cf91e000 c04dbdec > > c024626c > > bcc0: cf85bb00 00000000 00000000 00000039 00010004 c04da000 c04e92d4 > > c008e514 > > bce0: 00000000 c04ec2f0 00000039 cf85bb00 00010005 c009039c 00000039 > > c04dbf88 > > bd00: 00000033 c003406c 20000113 ffffffff fa200000 c0034ac4 c04e930c > > c04e9310 > > bd20: 00000001 c04e9330 00000000 00000039 00000033 00000000 00000003 > > 60000113 > > bd40: c04e92d4 c04dbdec 00003bc1 c04dbd60 c0062ae4 c0062ae8 20000113 > > ffffffff > > bd60: ffffffff c04da000 00000000 c00985c0 00000041 c0525808 c07a2000 > > c04da000 > > bd80: 00000001 ffffffff c04e91a0 c04e8cf8 00000001 c04e91a0 00000001 > > c04dbf88 > > bda0: c04da000 c04dd140 c04dd13c c04dbe60 00000000 c04dcfa8 c04dbdec > > c037a1dc > > bdc0: c044d7e4 c04dbdd4 00000000 c005ba0c c044d7e4 c04dd1a0 00000000 > > 00010003 > > bde0: c04dcfa8 c04da000 c04dbe1c c037a364 00000000 c04dd020 00010002 > > ffffb8ed > > be00: c0535e40 ffffb86d 00000002 c04dbe60 00000000 c04dcfa8 c04dbe84 > > c037ada4 > > be20: cf91e078 c05365b4 c05365b4 ffffb8ed c006b738 c04dcfa8 c0535e40 > > a0000113 > > be40: c04da000 00000080 cf91e018 c037aa84 cf91e000 00000001 c04dcfa8 > > c005ea84 > > be60: cf91e01c cf91e01c cf91e000 cf91e000 00008601 c04dbedc 00000000 > > 00000002 > > be80: cf91e078 c0246040 cf91e048 c04dbedc 00000002 cf91e048 00000000 > > ffffb86d > > bea0: c04dbedc 00000002 00000000 00000000 fb058018 c024335c cf884dc0 > > cf99bdc0 > > bec0: c04dbef4 00000000 cf99bde8 00000000 00000143 c023ad18 c00412a4 > > 00000038 > > bee0: c04d0001 c04dbeff 00010038 c008000a c04dbef4 0000009c 32d6627d > > 1000009c > > bf00: 22757cc8 cf9a1ac0 00000000 00000000 00000143 00000000 00000000 > > 00000143 > > bf20: fb058018 c008e514 00000000 c04f1610 00000143 cf9a1ac0 c04ebbc0 > > c009039c > > bf40: c04e8088 00000001 00000022 c004ca3c c004c944 00000022 00000000 > > c002b014 > > bf60: 00000002 00000001 c04da000 0000001f 00000000 c003406c 60000013 > > ffffffff > > bf80: fa200000 c0034ac4 00000000 00000000 c04eacf8 c0046a88 c04da000 > > c002b018 > > bfa0: c002b014 c04ddc60 80028d24 411fc083 0000001f 00000000 c04dbf38 > > c04dbfd0 > > bfc0: c00462e8 c0036434 60000013 ffffffff c0538b80 c0008918 c0008480 > > 00000000 > > bfe0: 00000000 c002b018 00000000 10c53c7d c0523fd8 80008034 00000000 > > 00000000 > > Code: bad PC value > > ---[ end trace 5f1d6aa71e65dba4 ]--- > > Kernel panic - not syncing: Fatal exception in interrupt > > [<c003b550>] (unwind_backtrace+0x0/0xd0) from [<c037a100>] (panic > > +0x54/0x118) > > [<c037a100>] (panic+0x54/0x118) from [<c0039380>] (die+0x278/0x2b4) > > [<c0039380>] (die+0x278/0x2b4) from [<c003c398>] (__do_kernel_fault > > +0x64/0x74) > > [<c003c398>] (__do_kernel_fault+0x64/0x74) from [<c003c56c>] > > (do_page_fault+0x1c4/0x1d8) > > [<c003c56c>] (do_page_fault+0x1c4/0x1d8) from [<c003421c>] > > (do_PrefetchAbort+0x34/0x98) > > [<c003421c>] (do_PrefetchAbort+0x34/0x98) from [<c0034bf0>] (__pabt_svc > > +0x50/0xa0) > > Exception stack(0xc04dbbe8 to 0xc04dbc30) > > bbe0: c04e8cc8 c04dcfa8 00000001 00000000 c04dcfa8 > > c04e8cc8 > > bc00: 00000000 00000000 00000002 00000000 00000000 c04dbc44 00000016 > > c04dbc30 > > bc20: c005aaac 00000000 20000193 ffffffff > > [<c0034bf0>] (__pabt_svc+0x50/0xa0) from [<c005aaac>] (enqueue_task > > +0x28/0x34) > > [<c005aaac>] (enqueue_task+0x28/0x34) from [<c005ab70>] (activate_task > > +0x34/0x44) > > [<c005ab70>] (activate_task+0x34/0x44) from [<c005e9b8>] (try_to_wake_up > > +0x7c/0x148) > > [<c005e9b8>] (try_to_wake_up+0x7c/0x148) from [<c005aef0>] > > (__wake_up_common+0x44/0x78) > > [<c005aef0>] (__wake_up_common+0x44/0x78) from [<c005cf14>] (complete > > +0x4c/0x88) > > [<c005cf14>] (complete+0x4c/0x88) from [<c024626c>] (omap_i2c_isr > > +0x118/0x4b0) > > [<c024626c>] (omap_i2c_isr+0x118/0x4b0) from [<c008e514>] > > (handle_IRQ_event+0x34/0xf0) > > [<c008e514>] (handle_IRQ_event+0x34/0xf0) from [<c009039c>] > > (handle_level_irq+0xcc/0x170) > > [<c009039c>] (handle_level_irq+0xcc/0x170) from [<c003406c>] (asm_do_IRQ > > +0x6c/0x8c) > > [<c003406c>] (asm_do_IRQ+0x6c/0x8c) from [<c0034ac4>] (__irq_svc > > +0x44/0xa8) > > Exception stack(0xc04dbd18 to 0xc04dbd60) > > bd00: c04e930c > > c04e9310 > > bd20: 00000001 c04e9330 00000000 00000039 00000033 00000000 00000003 > > 60000113 > > bd40: c04e92d4 c04dbdec 00003bc1 c04dbd60 c0062ae4 c0062ae8 20000113 > > ffffffff > > [<c0034ac4>] (__irq_svc+0x44/0xa8) from [<c0062ae8>] (vprintk > > +0x328/0x388) > > [<c0062ae8>] (vprintk+0x328/0x388) from [<c037a1dc>] (printk+0x18/0x24) > > [<c037a1dc>] (printk+0x18/0x24) from [<c005ba0c>] (__schedule_bug > > +0x34/0x60) > > [<c005ba0c>] (__schedule_bug+0x34/0x60) from [<c037a364>] (schedule > > +0x78/0x344) > > [<c037a364>] (schedule+0x78/0x344) from [<c037ada4>] (schedule_timeout > > +0x1c8/0x200) > > [<c037ada4>] (schedule_timeout+0x1c8/0x200) from [<c037aa84>] > > (wait_for_common+0xe8/0x1a8) > > [<c037aa84>] (wait_for_common+0xe8/0x1a8) from [<c0246040>] > > (omap_i2c_xfer+0x218/0x32c) > > [<c0246040>] (omap_i2c_xfer+0x218/0x32c) from [<c024335c>] (i2c_transfer > > +0xa8/0xf4) > > [<c024335c>] (i2c_transfer+0xa8/0xf4) from [<c023ad18>] (sitronix_ts_isr > > +0x74/0x1ac) > > [<c023ad18>] (sitronix_ts_isr+0x74/0x1ac) from [<c008e514>] > > (handle_IRQ_event+0x34/0xf0) > > [<c008e514>] (handle_IRQ_event+0x34/0xf0) from [<c009039c>] > > (handle_level_irq+0xcc/0x170) > > [<c009039c>] (handle_level_irq+0xcc/0x170) from [<c004ca3c>] > > (gpio_irq_handler+0xf8/0x128) > > [<c004ca3c>] (gpio_irq_handler+0xf8/0x128) from [<c003406c>] (asm_do_IRQ > > +0x6c/0x8c) > > [<c003406c>] (asm_do_IRQ+0x6c/0x8c) from [<c0034ac4>] (__irq_svc > > +0x44/0xa8) > > Exception stack(0xc04dbf88 to 0xc04dbfd0) > > bf80: 00000000 00000000 c04eacf8 c0046a88 c04da000 > > c002b018 > > bfa0: c002b014 c04ddc60 80028d24 411fc083 0000001f 00000000 c04dbf38 > > c04dbfd0 > > bfc0: c00462e8 c0036434 60000013 ffffffff > > [<c0034ac4>] (__irq_svc+0x44/0xa8) from [<c0036434>] (cpu_idle > > +0x58/0xc4) > > [<c0036434>] (cpu_idle+0x58/0xc4) from [<c0008918>] (start_kernel > > +0x25c/0x2bc) > > [<c0008918>] (start_kernel+0x25c/0x2bc) from [<80008034>] (0x80008034) > > Rebooting in 10 seconds.. > > > > -- > > Dave Lynch DLA Systems > > Software Development: Embedded Linux > > 717.587.7774 dhlii@xxxxxxxxxx http://www.dlasys.net > > Over 25 years' experience in platforms, languages, and technologies too > > numerous to list. > > > > "Any intelligent fool can make things bigger and more complex... It > > takes a touch of genius - and a lot of courage to move in the opposite > > direction." > > Albert Einstein > > > > > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-omap" in > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-i2c" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
