linux-kernel - [PATCH 4.14 162/267] USB: uas: heed CAPACITY

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Message-Id: <20191216174911.377392511@linuxfoundation.org>
Date:   Mon, 16 Dec 2019 18:48:08 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Oliver Neukum <oneukum@...e.com>
Subject: [PATCH 4.14 162/267] USB: uas: heed CAPACITY_HEURISTICS

From: Oliver Neukum <oneukum@...e.com>

commit 335cbbd5762d5e5c67a8ddd6e6362c2aa42a328f upstream.

There is no need to ignore this flag. We should be as close
to storage in that regard as makes sense, so honor flags whose
cost is tiny.

Signed-off-by: Oliver Neukum <oneukum@...e.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20191114112758.32747-3-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/storage/uas.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/storage/uas.c
+++ b/drivers/usb/storage/uas.c
@@ -845,6 +845,12 @@ static int uas_slave_configure(struct sc
 		sdev->fix_capacity = 1;
 
 	/*
+	 * in some cases we have to guess
+	 */
+	if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
+		sdev->guess_capacity = 1;
+
+	/*
 	 * Some devices don't like MODE SENSE with page=0x3f,
 	 * which is the command used for checking if a device
 	 * is write-protected.  Now that we tell the sd driver