From: Tejun Heo <htejun@gmail.com>
Date: Wed, 30 Jan 2008 09:18:26 +0000 (+0900)
Subject: libata: make EH fail gracefully if no reset method is available
X-Git-Tag: v2.6.26-rc1~1150^2~9
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=4f7faa3f2b99f8fb246c8cdeef971e55ceda4e52;p=~shefty%2Frdma-dev.git

libata: make EH fail gracefully if no reset method is available

When no reset method is available, libata currently oopses.  Although
the condition can't happen unless there's a bug in a low level driver,
oopsing isn't the best way to report the error condition.  Complain,
dump stack and fail reset instead.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ecbb8e90cb8..d94359a24d4 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2137,9 +2137,14 @@ int ata_eh_reset(struct ata_link *link, int classify,
 	if (hardreset) {
 		reset = hardreset;
 		ehc->i.action = ATA_EH_HARDRESET;
-	} else {
+	} else if (softreset) {
 		reset = softreset;
 		ehc->i.action = ATA_EH_SOFTRESET;
+	} else {
+		ata_link_printk(link, KERN_ERR, "BUG: no reset method, "
+				"please report to linux-ide@vger.kernel.org\n");
+		dump_stack();
+		return -EINVAL;
 	}
 
 	if (prereset) {