On Thu, 11 Aug 2016, Lu Baolu wrote: > 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@xxxxxxxxxxxxxxx # 3.14+ > Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> > Cc: Roger Tseng <rogerable@xxxxxxxxxxx> > Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> > --- > drivers/mfd/rtsx_usb.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) Applied, thanks. > diff --git a/drivers/mfd/rtsx_usb.c b/drivers/mfd/rtsx_usb.c > index dbd907d..691dab7 100644 > --- a/drivers/mfd/rtsx_usb.c > +++ b/drivers/mfd/rtsx_usb.c > @@ -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, -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
