Does the bridge driver call a clk_notifier_unregister on the exit path? > CPU: 0 Not tainted (2.6.28-omap1-00211-gcb75442 #1) > PC is at clk_notifier_register+0x68/0x108 > LR is at kmem_cache_alloc+0x7c/0x84 Taking an objdump of clock.o shows me it probably is crashing some place while trying to traverse through the existing list of registered notifiers. It could very well be that one of these is an old function pointer registered by the previous insmod of the bridge driver. > -----Original Message----- > From: Menon, Nishanth > Sent: Wednesday, March 11, 2009 8:21 PM > To: linux-omap@xxxxxxxxxxxxxxx > Cc: ext Paul Walmsley; Nayak, Rajendra; Gupta, Ramesh > Subject: DSPBRIDGE+BRIDGE_DVFS: Crashes on multiple reload > > Hi Folks, > > With the latest linux-omap pm + gitorious bridge changes on > SDP3430, enabling BRIDGE_DVFS and SRF seems to cause an issue > with clock notifier.. I am not entirely of the cause of the > issue(don't have a debugger handy at the moment :( ): The > condition is reproducible on exactly the third insmod of the > driver as explained below. Looking for any advice to fix this issue :( > > > Codebase: > git clone > git://git.kernel.org/pub/scm/linux/kernel/git/tmlind/linux-oma > p-2.6.git > git checkout -b pm --track origin/pm > git fetch git://gitorious.org/lk/mainline.git > tidspbridge-pm:tidspbridge-pm > git checkout tidspbridge-pm > git merge pm > > defconfig: > essentially omap_3430sdp_defconfig, enable SRF and > bridge+bridge_dvfs. (diff b/w defconfig and .config attached). > > Bootargs: > console=ttyS0,115200n8 noinitrd ip=dhcp root=/dev/nfs rw > nfsroot=<myIP>:<myFS>,nolock,wsize=1024,rsize=1024 mem=64M > > The error: > insmod ./bridgedriver.ko phys_mempool_base=0x87000000 > phys_mempool_size=0x600000 > rmmod bridgedriver > insmod ./bridgedriver.ko phys_mempool_base=0x87000000 > phys_mempool_size=0x600000 > rmmod bridgedriver > insmod ./bridgedriver.ko phys_mempool_base=0x87000000 > phys_mempool_size=0x600000 > > Unable to handle kernel paging request at virtual address 756e696c > pgd = c3e0c000 > *pgd=00000000[756e696c] > > Internal error: Oops: 5 [#1] > Modules linked in:Modules linked in: bridgedriver(+) > bridgedriver(+) [last unloaded: bridgedriver] [last unloaded: > bridgedriver] > > CPU: 0 Not tainted (2.6.28-omap1-00211-gcb75442 #1) > PC is at clk_notifier_register+0x68/0x108 > LR is at kmem_cache_alloc+0x7c/0x84 > pc : [<c003f684>] lr : [<c009f574>] psr: 00000093 > sp : c3e05da0 ip : c3e0b3e0 fp : c3e05dbc > <snip> > > Backtrace: Backtrace: > > [<c003f61c>] [<c003f61c>] (clk_notifier_register+0x0/0x108) > (clk_notifier_register+0x0/0x108) from [<bf08d394>] from > [<bf08d394>] (bridge_init+0x394/0x3ec [bridgedriver]) > (bridge_init+0x394/0x3ec [bridgedriver]) > r7:00000000 r7:00000000 r6:bf08ab88 r6:bf08ab88 r5:1dcd6500 > r5:1dcd6500 r4:0ee6b280 r4:0ee6b280 > > [<bf08d000>] [<bf08d000>] (bridge_init+0x0/0x3ec > [bridgedriver]) (bridge_init+0x0/0x3ec [bridgedriver]) from > [<c002d2d4>] from [<c002d2d4>] (do_one_initcall+0x64/0x198) > (do_one_initcall+0x64/0x198) > r8:c002df28 r8:c002df28 r7:00000000 r7:00000000 r6:4023a000 > r6:4023a000 r5:bf08a520 r5:bf08a520 r4:c03aa340 r4:c03aa340 > > [<c002d270>] [<c002d270>] (do_one_initcall+0x0/0x198) > (do_one_initcall+0x0/0x198) from [<c0078cac>] from > [<c0078cac>] (sys_init_module+0x98/0x188) > (sys_init_module+0x98/0x188) > [<c0078c14>] [<c0078c14>] (sys_init_module+0x0/0x188) > (sys_init_module+0x0/0x188) from [<c002dd80>] from > [<c002dd80>] (ret_fast_syscall+0x0/0x2c) > (ret_fast_syscall+0x0/0x2c) > r7:00000080 r7:00000080 r6:00000000 r6:00000000 r5:0000000b > r5:0000000b r4:00000000 r4:00000000 > > Code: Code: e5943000 e5943000 e1530006 e1530006 0a000005 > 0a000005 e2424008 e2424008 (e5942008) (e5942008) > > <4>---[ end trace c53b9e94a29571d4 ]--- > ---[ end trace c53b9e94a29571d4 ]--- > Segmentation fault > > > Regards, > Nishanth Menon > -- 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
