From: Chris Ball <chris@printf.net>
Date: Thu, 4 Sep 2014 16:11:53 +0000 (+0100)
Subject: mfd: rtsx_pcr: Fix MSI enable error handling
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=003f558269ba36d7b3b84c7dde9a77dd3646d0a3;p=linux-edison.git

mfd: rtsx_pcr: Fix MSI enable error handling

commit 5152970538a5e16c03bbcb9f1c780489a795ed40 upstream.

pci_enable_msi() can return failure with both positive and negative
integers -- it returns 0 for success -- but is only tested here for
"if (ret < 0)".  This causes us to try to use MSI on the RTS5249 SD
reader in the Dell XPS 11 when enabling MSI failed, causing:

[    1.737110] rtsx_pci: probe of 0000:05:00.0 failed with error -110

Reported-by: D. Jared Dominguez <Jared_Dominguez@Dell.com>
Tested-by: D. Jared Dominguez <Jared_Dominguez@Dell.com>
Signed-off-by: Chris Ball <chris@printf.net>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
index 45f26be359e..7e28bd0de55 100644
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -1137,7 +1137,7 @@ static int rtsx_pci_probe(struct pci_dev *pcidev,
 	pcr->msi_en = msi_en;
 	if (pcr->msi_en) {
 		ret = pci_enable_msi(pcidev);
-		if (ret < 0)
+		if (ret)
 			pcr->msi_en = false;
 	}