From: Ian Abbott Date: Fri, 10 May 2013 13:08:28 +0000 (+0100) Subject: staging: comedi: allow buffer resize if previous resize failed X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b3fab427739c76871c96834e72c369dd0e502d4b;p=linux-beck.git staging: comedi: allow buffer resize if previous resize failed When a comedi device is successfully attached, those subdevices that support asynchronous commands will have had buffers allocated successfully. It is possible to resize the buffers afterwards, but if the resize fails the subdevice is left with no buffer (`s->async->prealloc_buf == NULL`). Currently, this also causes any subsequent attempts to resize the buffer to fail with an error, which seems like a bad idea. Remove the check in `resize_async_buffer()` that causes the resize to fail if the subdevice currently has no buffer (presumably due to the failure of a previous resize attempt). Callers of `resize_async_buffer()` have already checked that the subdevice is allowed to have a buffer. Signed-off-by: Ian Abbott Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c index 00f2547024ec..924c54c9c31f 100644 --- a/drivers/staging/comedi/comedi_fops.c +++ b/drivers/staging/comedi/comedi_fops.c @@ -246,9 +246,6 @@ static int resize_async_buffer(struct comedi_device *dev, return -EBUSY; } - if (!async->prealloc_buf) - return -EINVAL; - /* make sure buffer is an integral number of pages * (we round up) */ new_size = (new_size + PAGE_SIZE - 1) & PAGE_MASK;