USB: g_file_storage: automatically disable stalls under Atmel

This patch (as1220) automatically disables stalls when g_file_storage
finds itself running with an Atmel device controller, because the
Atmel hardware/driver isn't capable of halting bulk endpoints
correctly.

Reported-by: Stanislaw Gruszka <stf_xl@wp.pl>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index b10fa31cc91..1ab9dac7e12 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -3879,7 +3879,11 @@ static int __init check_parameters(struct fsg_dev *fsg)
         mod_data.protocol_type = USB_SC_SCSI;
         mod_data.protocol_name = "Transparent SCSI";
 
-        if (gadget_is_sh(fsg->gadget))
+        /* Some peripheral controllers are known not to be able to
+         * halt bulk endpoints correctly.  If one of them is present,
+         * disable stalls.
+         */
+        if (gadget_is_sh(fsg->gadget) || gadget_is_at91(fsg->gadget))
                 mod_data.can_stall = 0;
 
         if (mod_data.release == 0xffff) {       // Parameter wasn't set