Hi Stefano, On 10/09/12 19:59, Stefano Babic wrote: > On AM3517, tx and rx interrupt are detected together with > the disconnect event. This generates a kernel panic in musb_interrupt, > because rx / tx are handled after disconnect. > This issue was seen on a Technexion's TAM3517 SOM. Unplugging a device, > tx / rx interrupts together with disconnect are detected. This brings > to kernel panic like this: > > [ 68.526153] Unable to handle kernel NULL pointer dereference at virtual address 00000011 > [ 68.534698] pgd = c0004000 > [ 68.537536] [00000011] *pgd=00000000 > [ 68.541351] Internal error: Oops: 17 [#1] ARM > [ 68.545928] Modules linked in: > [ 68.549163] CPU: 0 Not tainted (3.6.0-rc5-00020-g9e05905 #178) > [ 68.555694] PC is at rxstate+0x8/0xdc > [ 68.559539] LR is at musb_interrupt+0x98/0x858 > [ 68.564239] pc : [<c035cd88>] lr : [<c035af1c>] psr: 40000193 > [ 68.564239] sp : ce83fb40 ip : d0906410 fp : 00000000 > [ 68.576293] r10: 00000000 r9 : cf3b0e40 r8 : 00000002 > [ 68.581817] r7 : 00000019 r6 : 00000001 r5 : 00000001 r4 : 000000d4 > [ 68.588684] r3 : 00000000 r2 : 00000000 r1 : ffffffcc r0 : cf23c108 > [ 68.595550] Flags: nZcv IRQs off FIQs on Mode SVC_32 ISA ARM Segment ke > > Note: this behavior is not seen with a USB hub, while it is > easy to reproduce connecting a USB-pen directly to the USB-A of > the board. > > Drop tx / rx interrupts if disconnect is detected. > > Signed-off-by: Stefano Babic <sbabic@xxxxxxx> > CC: Felipe Balbi <balbi@xxxxxx> > Tested-by: Dmitry Lifshitz <lifshitz@xxxxxxxxxxxxxx> > Tested-by: Igor Grinberg <grinberg@xxxxxxxxxxxxxx> You should add stable here, just like: Cc: stable@xxxxxxxxxxxxxxx then git send-email will add the cc tags to the envelope. -- Regards, Igor. -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
