From: Mike Lockwood <lockwood@android.com>
Date: Thu, 29 Jul 2010 18:42:24 +0000 (-0400)
Subject: USB: g_mass_storage: Always allow disabling mass storage by writing to lun file
X-Git-Tag: firefly_0821_release~9833^2~5^2~161
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b4ff5d8efec50d4764579bee4fc3052bb9a9f2dc;p=firefly-linux-kernel-4.4.55.git

USB: g_mass_storage: Always allow disabling mass storage by writing to lun file

For android builds we disable the check for curlun->prevent_medium_removal.
Instead we let the framework manage unmounting policy, as we sometimes need
to unmount after the media has been removed.
This also helps support hosts that do not inform the device when the media
has been unmounted.

Signed-off-by: Mike Lockwood <lockwood@android.com>
---

diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 484acfb1a7c5..2771166ac69a 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -805,10 +805,16 @@ static ssize_t fsg_store_file(struct device *dev, struct device_attribute *attr,
 	struct rw_semaphore	*filesem = dev_get_drvdata(dev);
 	int		rc = 0;
 
+
+#ifndef CONFIG_USB_ANDROID_MASS_STORAGE
+	/* disabled in android because we need to allow closing the backing file
+	 * if the media was removed
+	 */
 	if (curlun->prevent_medium_removal && fsg_lun_is_open(curlun)) {
 		LDBG(curlun, "eject attempt prevented\n");
 		return -EBUSY;				/* "Door is locked" */
 	}
+#endif
 
 	/* Remove a trailing newline */
 	if (count > 0 && buf[count-1] == '\n')