Hello people,
Meanwhile I've moved a bit further and now I have another. The listing
below shows basically that dma_alloc_coherent() was called from irq
context which is not a good thing to do IIRC. Here this happens because
gadget driver (specifically, g_serial's composite_setup() function in
this case) is called from irq context by dwc driver and then requests EP
change which subsequently results in dma_alloc_coherent as implemented
in dwc driver. (g_file_storage does not show this problem for some reason)
So, supposedly something have to be moved out of irq context
(scheduled). Now this is a bit too compicated for me to start from
scratch, so question is, is there something I could use as a known-good
reference example?
Thank you.
Nikolai
[ 45.960000] BUG: scheduling while atomic: swapper/0/0x40010000
[ 45.960000] Modules linked in: g_serial dwc_otg usbcore
[ 45.960000]
[ 45.960000] Pid: 0, comm: swapper
[ 45.960000] CPU: 0 Not tainted (2.6.34-aml-z1 #24)
[ 45.960000] PC is at default_idle+0x2c/0x30
[ 45.960000] LR is at default_idle+0x28/0x30
[ 45.960000] pc : [<80024a78>] lr : [<80024a74>] psr: 60000013
[ 45.960000] sp : 803cbf90 ip : 803cbfa0 fp : 803cbf9c
[ 45.960000] r10: 0000001f r9 : 411fc091 r8 : 8001d28c
[ 45.960000] r7 : 803cedd0 r6 : 803cedd8 r5 : 803f2264 r4 : 803ca000
[ 45.960000] r3 : 00000000 r2 : 803cbf90 r1 : 803ca010 r0 : 803ca000
[ 45.960000] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM
Segment kernel
[ 45.960000] Control: 10c53c7d Table: 9ff24059 DAC: 00000017
[ 45.960000] [<800250f8>] (show_regs+0x0/0x50) from [<80038108>]
(__schedule_bug+0x54/0x60)
[ 45.960000] r4:803cbf48 r3:60000193
[ 45.960000] [<800380b4>] (__schedule_bug+0x0/0x60) from [<802ea610>]
(schedule+0x3d8/0x4a8)
[ 45.960000] r4:803d15f8 r3:40010000
[ 45.960000] [<802ea238>] (schedule+0x0/0x4a8) from [<8003a178>]
(__cond_resched+0x28/0x38)
[ 45.960000] [<8003a150>] (__cond_resched+0x0/0x38) from [<802ea7f0>]
(_cond_resched+0x3c/0x44)
[ 45.960000] r4:80427748 r3:803ca000
[ 45.960000] [<802ea7b4>] (_cond_resched+0x0/0x44) from [<8008bd84>]
(__alloc_pages_nodemask+0x118/0x5a8)
[ 45.960000] [<8008bc6c>] (__alloc_pages_nodemask+0x0/0x5a8) from
[<80029a48>] (__dma_alloc+0x90/0x32c)
[ 45.960000] [<800299b8>] (__dma_alloc+0x0/0x32c) from [<80029d78>]
(dma_alloc_coherent+0x60/0x68)
[ 45.960000] [<80029d18>] (dma_alloc_coherent+0x0/0x68) from
[<7f04c600>] (dwc_otg_ep_alloc_desc_chain+0x20/0x24 [dwc_otg])
[ 45.960000] r7:7f062df0 r6:9fc14000 r5:9fd444d0 r4:9fc14194
[ 45.960000] [<7f04c5e0>] (dwc_otg_ep_alloc_desc_chain+0x0/0x24
[dwc_otg]) from [<7f04d154>] (dwc_otg_pcd_ep_enable+0x12c/0x3ac [dwc_otg])
[ 45.960000] [<7f04d028>] (dwc_otg_pcd_ep_enable+0x0/0x3ac [dwc_otg])
from [<7f07f324>] (acm_set_alt+0x54/0x148 [g_serial])
[ 45.960000] r8:9fe282c0 r7:9fd444a8 r6:9fc14000 r5:9fe28440 r4:9fd4ad80
[ 45.960000] [<7f07f2d0>] (acm_set_alt+0x0/0x148 [g_serial]) from
[<7f080950>] (composite_setup+0xd48/0xe8c [g_serial])
[ 45.960000] r5:9fe28440 r4:9fd4ad80
[ 45.960000] [<7f07fc08>] (composite_setup+0x0/0xe8c [g_serial]) from
[<7f04f1c8>] (handle_ep0+0x828/0x17c8 [dwc_otg])
[ 45.960000] [<7f04e9a0>] (handle_ep0+0x0/0x17c8 [dwc_otg]) from
[<7f05267c>] (dwc_otg_pcd_handle_out_ep_intr+0x24c/0x68c [dwc_otg])
[ 45.960000] [<7f052430>] (dwc_otg_pcd_handle_out_ep_intr+0x0/0x68c
[dwc_otg]) from [<7f052bd0>] (dwc_otg_pcd_handle_intr+0x114/0x288 [dwc_otg])
[ 45.960000] [<7f052abc>] (dwc_otg_pcd_handle_intr+0x0/0x288
[dwc_otg]) from [<7f04ce28>] (dwc_otg_pcd_irq+0x14/0x20 [dwc_otg])
[ 45.960000] r8:8001d28c r7:0000001e r6:00000000 r5:00000000 r4:9fe28380
[ 45.960000] r3:00000001
[ 45.960000] [<7f04ce14>] (dwc_otg_pcd_irq+0x0/0x20 [dwc_otg]) from
[<80074ab4>] (handle_IRQ_event+0x58/0x120)
[ 45.960000] [<80074a5c>] (handle_IRQ_event+0x0/0x120) from
[<80076814>] (handle_level_irq+0x7c/0x10c)
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