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

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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: stable@vger.kernel.org # 3.14+
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Roger Tseng <rogerable@realtek.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Lu Baolu 2016-08-11 10:39:03 +08:00 committed by Lee Jones
parent 09185a5999
commit 8dcc5ff8fc
1 changed files with 5 additions and 5 deletions
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10
drivers/mfd/rtsx_usb.c
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@ -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,