linux-kernel - [PATCH 3.12 51/88] usb: musb: Ensure rx reinit occurs for shared

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Message-Id: <4cce7be6869fd6388426d6685013ad34c98fdfad.1468483951.git.jslaby@suse.cz>
Date:	Thu, 14 Jul 2016 10:15:43 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Andrew Goodbody <andrew.goodbody@...brionix.com>,
	Bin Liu <b-liu@...com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 51/88] usb: musb: Ensure rx reinit occurs for shared_fifo endpoints

From: Andrew Goodbody <andrew.goodbody@...brionix.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit f3eec0cf784e0d6c47822ca6b66df3d5812af7e6 upstream.

shared_fifo endpoints would only get a previous tx state cleared
out, the rx state was only cleared for non shared_fifo endpoints
Change this so that the rx state is cleared for all endpoints.
This addresses an issue that resulted in rx packets being dropped
silently.

Signed-off-by: Andrew Goodbody <andrew.goodbody@...brionix.com>
Signed-off-by: Bin Liu <b-liu@...com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/musb/musb_host.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/musb/musb_host.c b/drivers/usb/musb/musb_host.c
index 7a149719d495..7be2ad0a10f4 100644
--- a/drivers/usb/musb/musb_host.c
+++ b/drivers/usb/musb/musb_host.c
@@ -584,14 +584,13 @@ musb_rx_reinit(struct musb *musb, struct musb_qh *qh, struct musb_hw_ep *ep)
 		musb_writew(ep->regs, MUSB_TXCSR, 0);
 
 	/* scrub all previous state, clearing toggle */
-	} else {
-		csr = musb_readw(ep->regs, MUSB_RXCSR);
-		if (csr & MUSB_RXCSR_RXPKTRDY)
-			WARNING("rx%d, packet/%d ready?\n", ep->epnum,
-				musb_readw(ep->regs, MUSB_RXCOUNT));
-
-		musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
 	}
+	csr = musb_readw(ep->regs, MUSB_RXCSR);
+	if (csr & MUSB_RXCSR_RXPKTRDY)
+		WARNING("rx%d, packet/%d ready?\n", ep->epnum,
+			musb_readw(ep->regs, MUSB_RXCOUNT));
+
+	musb_h_flush_rxfifo(ep, MUSB_RXCSR_CLRDATATOG);
 
 	/* target addr and (for multipoint) hub addr/port */
 	if (musb->is_multipoint) {
-- 
2.9.1