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authorTomas Henzl <thenzl@redhat.com>2013-08-01 15:14:00 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-11-21 09:22:55 -0800
commit2e4ce498811f1aa2e9f2e600d442ad8da0ab6534 (patch)
tree30f87dc7dd339eae05df57f090250dc75c6f3629 /drivers/scsi
parent50e0289d813aceddedf962ea92299b68ac264671 (diff)
downloadlinux-linaro-stable-2e4ce498811f1aa2e9f2e600d442ad8da0ab6534.tar.gz
SCSI: hpsa: fix a race in cmd_free/scsi_done
commit 2cc5bfaf854463d9d1aa52091f60110fbf102a96 upstream. When the driver calls scsi_done and after that frees it's internal preallocated memory it can happen that a new job is enqueud before the memory is freed. The allocation fails and the message "cmd_alloc returned NULL" is shown. Patch below fixes it by moving cmd->scsi_done after cmd_free. Signed-off-by: Tomas Henzl <thenzl@redhat.com> Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com> Cc: Masoud Sharbiani <msharbiani@twitter.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/hpsa.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 287667c20c6a..62ed744bbe06 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -1206,8 +1206,8 @@ static void complete_scsi_command(struct CommandList *cp)
scsi_set_resid(cmd, ei->ResidualCnt);
if (ei->CommandStatus == 0) {
- cmd->scsi_done(cmd);
cmd_free(h, cp);
+ cmd->scsi_done(cmd);
return;
}
@@ -1380,8 +1380,8 @@ static void complete_scsi_command(struct CommandList *cp)
dev_warn(&h->pdev->dev, "cp %p returned unknown status %x\n",
cp, ei->CommandStatus);
}
- cmd->scsi_done(cmd);
cmd_free(h, cp);
+ cmd->scsi_done(cmd);
}
static void hpsa_pci_unmap(struct pci_dev *pdev,