Commit 0821e904 authored Apr 29, 2013 by Mike Miller Committed by Jens Axboe Apr 29, 2013

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>

parent e4292e05

drivers/block/cciss.c

+10 −0

Original line number	Diff line number	Diff line
		@@ -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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