Messages in this thread Patch in this message | | | From | Andrey Borzenkov <> | Subject | 2.5.75 - ppa unload PATCH and remaining problem | Date | Sun, 13 Jul 2003 18:47:39 +0400 |
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rmmod ppa does not remove any attached device nodes and gives:
ppa: Version 2.07 (for Linux 2.4.x) ppa: Found device at ID 4, Attempting to use EPP 32 bit ppa: Found device at ID 4, Attempting to use PS/2 ppa: Communication established with ID 4 using PS/2 scsi0 : Iomega VPI0 (ppa) interface Vendor: iomega Model: jaz 2GB Rev: E.17 Type: Direct-Access ANSI SCSI revision: 02 Attached scsi removable disk sda at scsi0, channel 0, id 4, lun 0 Attached scsi generic sg0 at scsi0, channel 0, id 4, lun 0, type 0 sda: Spinning up disk....ready SCSI device sda: 2091050 512-byte hdwr sectors (1071 MB) sda: Write Protect is off sda: Mode Sense: 39 00 10 08 SCSI device sda: drive cache: write through SCSI device sda: 2091050 512-byte hdwr sectors (1071 MB) sda: Write Protect is off sda: Mode Sense: 39 00 10 08 SCSI device sda: drive cache: write through /dev/scsi/host0/bus0/target4/lun0: p4 Releasing ppa0 Iomega VPI0 (ppa) interface did not call scsi_unregister Call Trace: [<d2d2fcf6>] exit_this_scsi_driver+0xb6/0xfa [ppa] [<c013f0ad>] sys_delete_module+0x11d/0x150 [<c015787b>] do_munmap+0x13b/0x1a0 [<c0157923>] sys_munmap+0x43/0x70 [<c011d920>] do_page_fault+0x0/0x4b8 [<c010b527>] syscall_call+0x7/0xb
adding scsi_unregister to ppa_release does remove all devices and sysfs node for ppa but leaves /dev/scsi/host0/bus0/target4 in place and does not remove /proc entries; loading ppa again creates second host with /proc/scsi looking funny:
{pts/3}% LC_ALL=C ls -l /proc/scsi total 0 -r--r--r-- 1 root root 0 Jul 13 18:42 device_info dr-xr-xr-x 2 root root 0 Jul 13 18:42 ppa/ dr-xr-xr-x 2 root root 0 Jul 13 18:42 ppa/ -r--r--r-- 1 root root 0 Jul 13 18:42 scsi dr-xr-xr-x 2 root root 0 Jul 13 18:42 sg/
attempt to access /proc/scsi after ppa has been unloaded (with my patch or without) even after the first time gives:
pts/3}% LC_ALL=C ls -lR /proc/scsi zsh: segmentation fault LC_ALL=C ls -F --color=auto -lR /proc/scsi
dmesg ->
Unable to handle kernel paging request at virtual address d2d42320 printing eip: c0199360 *pde = 09fa3067 *pte = 00000000 Oops: 0000 [#1] CPU: 0 EIP: 0060:[<c0199360>] Tainted: P EFLAGS: 00010202 EIP is at proc_get_inode+0xb0/0x1a0 eax: 00000000 ebx: c5a3e014 ecx: 00000002 edx: d2d42320 esi: c2f4a4fc edi: 00000001 ebp: c77afe30 esp: c77afe24 ds: 007b es: 007b ss: 0068 Process ls (pid: 2893, threadinfo=c77ae000 task=c76c9000) Stack: 00000003 c5ab708b c2f4a54b c77afe5c c019cb29 cff93004 000011e7 c2f4a4fc c2f4a4fc ffffffea 00000000 fffffff4 cea33084 cea33014 c77afe80 c0173a25 cea33014 c5ab7004 c77aff30 c5ab7004 c77afef4 c77aff30 cffb08e4 c77afea0 Call Trace: [<c019cb29>] proc_lookup+0x169/0x190 [<c0173a25>] real_lookup+0xb5/0xe0 [<c0173ebd>] do_lookup+0x6d/0x80 [<c01744a7>] link_path_walk+0x5d7/0xb30 [<c014c129>] kmem_cache_alloc+0x99/0x1a0 [<c0174f92>] __user_walk+0x32/0x50 [<c016f127>] vfs_lstat+0x17/0x50 [<c016f724>] sys_lstat64+0x14/0x30 [<c01796f4>] sys_getdents64+0x74/0xb2 [<c017972d>] sys_getdents64+0xad/0xb2 [<c010b527>] syscall_call+0x7/0xb
Code: 83 3a 02 0f 84 aa 00 00 00 c1 e0 05 8d 04 10 f0 ff 80 a0 00 <6>note: ls[2893] exited with preempt_count 2 Debug: sleeping function called from illegal context at include/asm/semaphore.h:119 Call Trace: [<c0122bb8>] __might_sleep+0x58/0x70 [<c01560bb>] remove_shared_vm_struct+0x2b/0x90 [<c0157cfa>] exit_mmap+0x19a/0x250 [<c012375c>] mmput+0x8c/0x100 [<c012868c>] do_exit+0x19c/0x690 [<c010cbf7>] die+0x137/0x140 [<c011da6a>] do_page_fault+0x14a/0x4b8 [<c014c1bb>] kmem_cache_alloc+0x12b/0x1a0 [<c0199107>] proc_alloc_inode+0x17/0x70 [<c0199136>] proc_alloc_inode+0x46/0x70 [<c011d920>] do_page_fault+0x0/0x4b8 [<c010c54d>] error_code+0x2d/0x40 [<c018007b>] d_delete+0x15b/0x270 [<c0199360>] proc_get_inode+0xb0/0x1a0 [<c019cb29>] proc_lookup+0x169/0x190 [<c0173a25>] real_lookup+0xb5/0xe0 [<c0173ebd>] do_lookup+0x6d/0x80 [<c01744a7>] link_path_walk+0x5d7/0xb30 [<c014c129>] kmem_cache_alloc+0x99/0x1a0 [<c0174f92>] __user_walk+0x32/0x50 [<c016f127>] vfs_lstat+0x17/0x50 [<c016f724>] sys_lstat64+0x14/0x30 [<c01796f4>] sys_getdents64+0x74/0xb2 [<c017972d>] sys_getdents64+0xad/0xb2 [<c010b527>] syscall_call+0x7/0xb
Any pointers appreciated. It is tainted by nVidia if question arises.
TIA
-andrey --- linux-2.5.75-smp/drivers/scsi/ppa.c.scsi_unregister 2003-06-26 21:41:23.000000000 +0400 +++ linux-2.5.75-smp/drivers/scsi/ppa.c 2003-07-13 18:05:07.000000000 +0400 @@ -76,6 +76,7 @@ int ppa_release(struct Scsi_Host *host) int host_no = host->unique_id; printk("Releasing ppa%i\n", host_no); + scsi_unregister(host); parport_unregister_device(ppa_hosts[host_no].dev); return 0; } | |