From: Daniel Walker <dwalker@codeaurora.org>
Date: Tue, 27 Jul 2010 21:04:30 +0000 (-0700)
Subject: drivers: video: msm: fix hang on disable_irq
X-Git-Tag: v2.6.37-rc1~27^3~2
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?p=pandora-kernel.git;a=commitdiff_plain;h=5ad43ff98ac926e37ecbdef04ba7d4d104604028

drivers: video: msm: fix hang on disable_irq

There's a resource race around disable_irq. Using the nosync
version allows the function to continue and prevents the hang.

Adapted from Arve Hjønnevåg <arve@android.com> changes in the Google tree.

Signed-off-by: Daniel Walker <dwalker@codeaurora.org>
---

diff --git a/drivers/video/msm/mdp.c b/drivers/video/msm/mdp.c
index 3c28db03ad39..2b5bf79ffe75 100644
--- a/drivers/video/msm/mdp.c
+++ b/drivers/video/msm/mdp.c
@@ -90,7 +90,7 @@ static int locked_disable_mdp_irq(struct mdp_info *mdp, uint32_t mask)
 	mdp_irq_mask &= ~(mask);
 	/* if no one is waiting on the interrupt, disable it */
 	if (!mdp_irq_mask) {
-		disable_irq(mdp->irq);
+		disable_irq_nosync(mdp->irq);
 		if (clk)
 			clk_disable(clk);
 	}