From 61d7416a286e840d905c18b1e6b0977c036c8656 Mon Sep 17 00:00:00 2001 From: "Alan D. Brunelle" Date: Tue, 29 Apr 2008 16:12:51 -0400 Subject: [PATCH] [SCSI] bug fix for free list handling commit: commit 542bd1377a963070bc4a03ff7d2690ddf3920596 Author: James Bottomley 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 Signed-off-by: James Bottomley --- drivers/scsi/scsi.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 12d69d7c8577..749c9c7fc2e1 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; -- 2.39.5