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authorMike Miller <mike.miller@hp.com>2013-04-29 11:55:54 -0700
committerJens Axboe <axboe@kernel.dk>2013-04-29 21:24:02 +0200
commit0821e904057505c7e25d72e1a282105d023b26c9 (patch)
tree164d3d5aa6730415bf7573b1f5430a8398c59956 /drivers/block/cciss.c
parente4292e05d4c1bb4e64c299ea4b378a0f66d3cc8a (diff)
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cciss: bug fix to prevent cciss from loading in kdump crash kernel
By default the cciss driver supports all "older" HP Smart Array controllers and hpsa supports all controllers starting with the G6 family. There are module parameters that allow a user to override those defaults and use hpsa for any HP Smart Array controller. If the user does override the default behavior and uses hpsa for older controllers it is possible that cciss may try to load in a kdump crash kernel. This may happen if cciss is loaded first from the kdump initrd image. If cciss does load rather than hpsa and reset_devices is true we immediately call cciss_hard_reset_controller. This will result in a kernel panic and the core file cannot be created. This patch prevents cciss from trying to load in this scenario. Signed-off-by: Mike Miller <mike.miller@hp.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block/cciss.c')
-rw-r--r--drivers/block/cciss.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 2b485ca1150b..2cd230cfa813 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -4970,6 +4970,16 @@ static int cciss_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
ctlr_info_t *h;
unsigned long flags;
+ /*
+ * By default the cciss driver is used for all older HP Smart Array
+ * controllers. There are module paramaters that allow a user to
+ * override this behavior and instead use the hpsa SCSI driver. If
+ * this is the case cciss may be loaded first from the kdump initrd
+ * image and cause a kernel panic. So if reset_devices is true and
+ * cciss_allow_hpsa is set just bail.
+ */
+ if ((reset_devices) && (cciss_allow_hpsa == 1))
+ return -ENODEV;
rc = cciss_init_reset_devices(pdev);
if (rc) {
if (rc != -ENOTSUPP)
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