From 75230ff2751e88d594a13a70eae2c146f45e323b Mon Sep 17 00:00:00 2001 From: "Stephen M. Cameron" Date: Mon, 23 Aug 2010 11:02:17 +0200 Subject: [PATCH] cciss: disable doorbell reset on reset_devices The doorbell reset initially appears to work correctly, the controller resets, comes up, some i/o can even be done, but on at least some Smart Arrays in some servers, it eventually causes a subsequent controller lockup due to some kind of PCIe error, and kdump can end up leaving the root filesystem in an unbootable state. For this reason, until the problem is fixed, or at least isolated to certain hardware enough to be avoided, the doorbell reset should not be used at all. Signed-off-by: Stephen M. Cameron Signed-off-by: Jens Axboe --- drivers/block/cciss.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index 31064df1370a..ce1a75df5902 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -4519,6 +4519,12 @@ static __devinit int cciss_kdump_hard_reset_controller(struct pci_dev *pdev) misc_fw_support = readl(&cfgtable->misc_fw_support); use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET; + /* The doorbell reset seems to cause lockups on some Smart + * Arrays (e.g. P410, P410i, maybe others). Until this is + * fixed or at least isolated, avoid the doorbell reset. + */ + use_doorbell = 0; + rc = cciss_controller_hard_reset(pdev, vaddr, use_doorbell); if (rc) goto unmap_cfgtable; -- 2.34.1