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| author | Alan D. Brunelle <Alan.Brunelle@hp.com> | 2008-04-29 16:12:51 -0400 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2008-04-29 19:37:32 -0500 |
| commit | 61d7416a286e840d905c18b1e6b0977c036c8656 (patch) | |
| tree | fd2f3e837df0f7545fbc1d1467602c9934b35849 | |
| parent | 49dd09613cf8ae3b697c341c501b7526b462cfeb (diff) | |
| download | op-kernel-dev-61d7416a286e840d905c18b1e6b0977c036c8656.zip op-kernel-dev-61d7416a286e840d905c18b1e6b0977c036c8656.tar.gz | |
[SCSI] bug fix for free list handling
commit:
commit 542bd1377a963070bc4a03ff7d2690ddf3920596
Author: James Bottomley <James.Bottomley@HansenPartnership.com>
Date: Mon Apr 21 10:57:20 2008 -0500
[SCSI] fix SLUB WARN_ON
Fixed another problem in free list handling by moving list allocation
from scsi_host_alloc() to scsi_add_host(). Unfortunately it
introduced a new failure mode in that hosts can pass straight from
alloc to put without going through add, leaving the free list
uninitialised.
Fix by checking shost->cmd_pool on the release path to see if it got
initialised.
Signed-off-by: Alan D. Brunelle <alan.brunelle@hp.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
| -rw-r--r-- | drivers/scsi/scsi.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 12d69d7..749c9c7 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -469,6 +469,7 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost) cmd = scsi_pool_alloc_command(shost->cmd_pool, gfp_mask); if (!cmd) { scsi_put_host_cmd_pool(gfp_mask); + shost->cmd_pool = NULL; return -ENOMEM; } list_add(&cmd->list, &shost->free_list); @@ -481,6 +482,13 @@ int scsi_setup_command_freelist(struct Scsi_Host *shost) */ void scsi_destroy_command_freelist(struct Scsi_Host *shost) { + /* + * If cmd_pool is NULL the free list was not initialized, so + * do not attempt to release resources. + */ + if (!shost->cmd_pool) + return; + while (!list_empty(&shost->free_list)) { struct scsi_cmnd *cmd; |
