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authorBjorn Helgaas <bjorn.helgaas@hp.com>2007-04-11 23:28:43 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-04-12 15:31:42 -0700
commitb6550777a32f7204f87475beb4f40d054fb8d4b4 (patch)
tree3ab8e8ca76644b52af4b5796583f75068cf789f7
parent1668be71ccae5a9610fc8a224bd80fbe852f93ae (diff)
downloadlinux-sh-b6550777a32f7204f87475beb4f40d054fb8d4b4.tar.gz
[PATCH] cciss: unregister from SCSI before tearing down device resources
We must unregister from SCSI before we unmap device resources and unhook the IRQ handler. Otherwise, SCSI may send us more requests, and we won't be able to handle them. I see the following oops during every reboot of my HP DL360: ... Unmounting local filesystems...done. Rebooting... Completed flushing cache on controller 0 BUG: unable to handle kernel paging request at virtual address f8808040 printing eip: c02dc72b *pde = 02120067 *pte = 00000000 Oops: 0002 [#1] SMP Modules linked in: CPU: 1 EIP: 0060:[<c02dc72b>] Not tainted VLI EFLAGS: 00010046 (2.6.21-rc6 #1) EIP is at SA5_submit_command+0xb/0x20 eax: f8808000 ebx: f7a00000 ecx: f79f0000 edx: 37a00000 esi: f79f0000 edi: 00000000 ebp: 00000000 esp: dd717a44 ds: 007b es: 007b fs: 00d8 gs: 0000 ss: 0068 Process khelper (pid: 1427, ti=dd716000 task=c2260a70 task.ti=dd716000) Stack: c02df2c0 f7a00000 f7a00000 00d41008 c02df691 00000000 00000010 00000002 00000001 f79f0000 f7fff844 c1398420 00000000 00000000 00001000 230a3020 69666564 5420656e 50434f49 465f544b 4853554c 44414552 0a312009 66656423 Call Trace: [<c02df2c0>] start_io+0x80/0x120 [<c02df691>] do_cciss_request+0x331/0x350 [<c014242a>] mempool_alloc+0x2a/0xe0 [<c020ad71>] blk_alloc_request+0x61/0x80 [<c020b02e>] get_request+0x15e/0x1e0 [<c01595e0>] cache_alloc_refill+0xb0/0x1e0 [<c021049d>] as_update_rq+0x2d/0x80 [<c0210d28>] as_add_request+0x68/0x90 [<c0207f99>] elv_insert+0x119/0x160 [<c020bd0b>] __make_request+0xcb/0x320 [<c0122ee0>] lock_timer_base+0x20/0x50 [<c0123096>] del_timer+0x56/0x60 [<c020a7b8>] blk_remove_plug+0x38/0x70 [<c020a815>] __generic_unplug_device+0x25/0x30 [<c020a835>] generic_unplug_device+0x15/0x30 ... Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Acked-by: Mike Miller <mike.miller@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/block/cciss.c35
1 files changed, 19 insertions, 16 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 14d780666c0a..65a725cd3422 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3423,6 +3423,25 @@ static void cciss_remove_one(struct pci_dev *pdev)
"already be removed \n");
return;
}
+
+ remove_proc_entry(hba[i]->devname, proc_cciss);
+ unregister_blkdev(hba[i]->major, hba[i]->devname);
+
+ /* remove it from the disk list */
+ for (j = 0; j < CISS_MAX_LUN; j++) {
+ struct gendisk *disk = hba[i]->gendisk[j];
+ if (disk) {
+ request_queue_t *q = disk->queue;
+
+ if (disk->flags & GENHD_FL_UP)
+ del_gendisk(disk);
+ if (q)
+ blk_cleanup_queue(q);
+ }
+ }
+
+ cciss_unregister_scsi(i); /* unhook from SCSI subsystem */
+
/* Turn board interrupts off and send the flush cache command */
/* sendcmd will turn off interrupt, and send the flush...
* To write all data in the battery backed cache to disks */
@@ -3444,22 +3463,6 @@ static void cciss_remove_one(struct pci_dev *pdev)
#endif /* CONFIG_PCI_MSI */
iounmap(hba[i]->vaddr);
- cciss_unregister_scsi(i); /* unhook from SCSI subsystem */
- unregister_blkdev(hba[i]->major, hba[i]->devname);
- remove_proc_entry(hba[i]->devname, proc_cciss);
-
- /* remove it from the disk list */
- for (j = 0; j < CISS_MAX_LUN; j++) {
- struct gendisk *disk = hba[i]->gendisk[j];
- if (disk) {
- request_queue_t *q = disk->queue;
-
- if (disk->flags & GENHD_FL_UP)
- del_gendisk(disk);
- if (q)
- blk_cleanup_queue(q);
- }
- }
pci_free_consistent(hba[i]->pdev, hba[i]->nr_cmds * sizeof(CommandList_struct),
hba[i]->cmd_pool, hba[i]->cmd_pool_dhandle);