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Commit 9de8720a authored by Lu Baolu's avatar Lu Baolu Committed by Greg Kroah-Hartman
Browse files

mfd: rtsx_usb: Avoid setting ucr->current_sg.status 



commit 8dcc5ff8fcaf778bb57ab4448fedca9e381d088f upstream.

Member "status" of struct usb_sg_request is managed by usb core. A
spin lock is used to serialize the change of it. The driver could
check the value of req->status, but should avoid changing it without
the hold of the spinlock. Otherwise, it could cause race or error
in usb core.

This patch could be backported to stable kernels with version later
than v3.14.

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Roger Tseng <rogerable@realtek.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent a2afa5f1

drivers/mfd/rtsx_usb.c

+5 −5
Original line number Diff line number Diff line
@@ -46,9 +46,6 @@ static void rtsx_usb_sg_timed_out(unsigned long data) 


	dev_dbg(&ucr->pusb_intf->dev, "%s: sg transfer timed out", __func__);

	usb_sg_cancel(&ucr->current_sg);



	/* we know the cancellation is caused by time-out */

	ucr->current_sg.status = -ETIMEDOUT;

}



static int rtsx_usb_bulk_transfer_sglist(struct rtsx_ucr *ucr,
@@ -67,12 +64,15 @@ static int rtsx_usb_bulk_transfer_sglist(struct rtsx_ucr *ucr, 
	ucr->sg_timer.expires = jiffies + msecs_to_jiffies(timeout);

	add_timer(&ucr->sg_timer);

	usb_sg_wait(&ucr->current_sg);

	del_timer_sync(&ucr->sg_timer);

	if (!del_timer_sync(&ucr->sg_timer))

		ret = -ETIMEDOUT;

	else

		ret = ucr->current_sg.status;



	if (act_len)

		*act_len = ucr->current_sg.bytes;



	return ucr->current_sg.status;

	return ret;

}



int rtsx_usb_transfer_data(struct rtsx_ucr *ucr, unsigned int pipe,