cciss: fix problem that deleting multiple logical drives could cause a panic
authorStephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Thu, 18 Dec 2008 13:55:11 +0000 (14:55 +0100)
committerJens Axboe <jens.axboe@oracle.com>
Fri, 19 Dec 2008 07:14:07 +0000 (08:14 +0100)
Fix problem that deleting multiple logical drives could cause a panic.

It fixes a panic which can be easily reproduced in the following way: Just
create several "arrays," each with multiple logical drives via hpacucli,
then delete the first array, and it will blow up in deregister_disk(), in
the call to get_host() when it tries to dig the hba pointer out of a NULL
queue pointer.

The problem has been present since my code to make rebuild_lun_table
behave better went in.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cca.cpqcorp.net>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
drivers/block/cciss.c

index 9364dc554257e5af44a3a4a2aff7fc3f6598fa27..9f7c543cc04b265344b0e37443c4349147e88574 100644 (file)
@@ -1693,6 +1693,11 @@ static int rebuild_lun_table(ctlr_info_t *h, int first_time)
        for (i = 0; i <= h->highest_lun; i++) {
                int j;
                drv_found = 0;
+
+               /* skip holes in the array from already deleted drives */
+               if (h->drv[i].raid_level == -1)
+                       continue;
+
                for (j = 0; j < num_luns; j++) {
                        memcpy(&lunid, &ld_buff->LUN[j][0], 4);
                        lunid = le32_to_cpu(lunid);