From: Thomas Faber Date: Fri, 2 Mar 2012 08:41:50 +0000 (+0100) Subject: usb: gadgetfs: return number of bytes on ep0 read request X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=85b4b3c8c189e0159101f7628a71411af072ff69;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git usb: gadgetfs: return number of bytes on ep0 read request A read from GadgetFS endpoint 0 during the data stage of a control request would always return 0 on success (as returned by wait_event_interruptible) despite having written data into the user buffer. This patch makes it correctly set the return value to the number of bytes read. Signed-off-by: Thomas Faber Cc: stable Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c index ae04266dba1b..4f18a0e46070 100644 --- a/drivers/usb/gadget/inode.c +++ b/drivers/usb/gadget/inode.c @@ -1043,6 +1043,8 @@ ep0_read (struct file *fd, char __user *buf, size_t len, loff_t *ptr) // FIXME don't call this with the spinlock held ... if (copy_to_user (buf, dev->req->buf, len)) retval = -EFAULT; + else + retval = len; clean_req (dev->gadget->ep0, dev->req); /* NOTE userspace can't yet choose to stall */ }