From: Anton Tikhomirov <av.tikhomirov@samsung.com>
Date: Tue, 6 Mar 2012 05:08:29 +0000 (+0900)
Subject: usb: s3c-hsotg: Avoid TxFIFO corruption in DMA mode
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=70fa030ffb652ace81dd5bcab01255b49723caec;p=~shefty%2Frdma-dev.git

usb: s3c-hsotg: Avoid TxFIFO corruption in DMA mode

Writing to TxFIFO relates only to Slave mode and leads to
TxFIFO corruption in DMA mode.

Signed-off-by: Anton Tikhomirov <av.tikhomirov@samsung.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
index 03de169ab36..8db23660b5e 100644
--- a/drivers/usb/gadget/s3c-hsotg.c
+++ b/drivers/usb/gadget/s3c-hsotg.c
@@ -1921,7 +1921,8 @@ static void s3c_hsotg_epint(struct s3c_hsotg *hsotg, unsigned int idx,
 		    ints & S3C_DIEPMSK_TxFIFOEmpty) {
 			dev_dbg(hsotg->dev, "%s: ep%d: TxFIFOEmpty\n",
 				__func__, idx);
-			s3c_hsotg_trytx(hsotg, hs_ep);
+			if (!using_dma(hsotg))
+				s3c_hsotg_trytx(hsotg, hs_ep);
 		}
 	}
 }