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authorPhilip J Kelleher <pjk1939@linux.vnet.ibm.com>2013-06-18 14:49:48 -0500
committerJens Axboe <axboe@kernel.dk>2013-06-19 13:52:10 +0200
commitb8b225da139f5770d7689b189fd5debc58f4b35d (patch)
treea34347978dc3ba97d1d3582f5fe7a90240e40a30 /drivers/block
parent3eb8dcafb5a73041e2f3b4a39c057a58e4354d83 (diff)
rsxx: Adding EEH check inside cregs timeout.
Unfortunaly, our CPU register path does not do any kind of EEH error checking. So to fix this issue, an ioread32 was added to the CPU register timeout code. This way, the driver can check to see if the timeout was caused by an EEH error or not. This is a dummy read. Signed-off-by: Philip J Kelleher <pjk1939@linux.vnet.ibm.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/rsxx/cregs.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/block/rsxx/cregs.c b/drivers/block/rsxx/cregs.c
index 4914464c19fc..926dce9c452f 100644
--- a/drivers/block/rsxx/cregs.c
+++ b/drivers/block/rsxx/cregs.c
@@ -431,6 +431,15 @@ static int __issue_creg_rw(struct rsxx_cardinfo *card,
*hw_stat = completion.creg_status;
if (completion.st) {
+ /*
+ * This read is needed to verify that there has not been any
+ * extreme errors that might have occurred, i.e. EEH. The
+ * function iowrite32 will not detect EEH errors, so it is
+ * necessary that we recover if such an error is the reason
+ * for the timeout. This is a dummy read.
+ */
+ ioread32(card->regmap + SCRATCH);
+
dev_warn(CARD_TO_DEV(card),
"creg command failed(%d x%08x)\n",
completion.st, addr);