linux-kernel - [PATCH 4.0 53/72] uas: Set max_sectors

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Date:	Mon, 11 May 2015 10:54:59 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Steve Bangert <sbangert@...ntier.com>,
	Hans de Goede <hdegoede@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [PATCH 4.0 53/72] uas: Set max_sectors_240 quirk for ASM1053 devices

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

------------------

From: Hans de Goede <hdegoede@...hat.com>

commit 8e779c6c4a398763c21371fe40f649206041dc1e upstream.

Testing has shown that ASM1053 devices do not work properly with transfers
larger than 240 sectors, so set max_sectors to 240 on these.

Reported-by: Steve Bangert <sbangert@...ntier.com>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Tested-by: Steve Bangert <sbangert@...ntier.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/storage/uas-detect.h |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/usb/storage/uas-detect.h
+++ b/drivers/usb/storage/uas-detect.h
@@ -74,7 +74,7 @@ static int uas_use_uas_driver(struct usb
 	 * this writing the following versions exist:
 	 * ASM1051 - no uas support version
 	 * ASM1051 - with broken (*) uas support
-	 * ASM1053 - with working uas support
+	 * ASM1053 - with working uas support, but problems with large xfers
 	 * ASM1153 - with working uas support
 	 *
 	 * Devices with these chips re-use a number of device-ids over the
@@ -104,6 +104,9 @@ static int uas_use_uas_driver(struct usb
 		} else if (usb_ss_max_streams(&eps[1]->ss_ep_comp) == 32) {
 			/* Possibly an ASM1051, disable uas */
 			flags |= US_FL_IGNORE_UAS;
+		} else {
+			/* ASM1053, these have issues with large transfers */
+			flags |= US_FL_MAX_SECTORS_240;
 		}
 	}
 


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