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authorChen Wang <unicornxx.wang@gmail.com>2013-07-19 06:15:18 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-07-25 23:01:13 +0400
commit140983c283b302167b387646218a97f112cc0c03 (patch)
treeb81f33befcac76ba7e7034e769bf3ce17afa76cc
parente6c7efdcb76f11b04e3d3f71c8d764ab75c9423b (diff)
downloadlinux-140983c283b302167b387646218a97f112cc0c03.tar.xz
USB: usb-skeleton.c: add retry for nonblocking read
Updated skel_read() in usb-skeleton.c. When there is no data in the buffer, we would allow retry for both blocking and nonblocking cases. Original logic give retry only for blocking case. Actually we can also allow retry for nonblocking case. This will reuse the existing retry logic and handle the return of -EAGAIN in one place. Also if the data to be read is short and can be retrieved in quick time, we can also give a chance for nonblocking case and may catch the data and copy it back to userspace in one read() call too. Signed-off-by: Chen Wang <unicornxx.wang@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/usb/usb-skeleton.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c
index 7ed3b039dbe8..ff97652343a3 100644
--- a/drivers/usb/usb-skeleton.c
+++ b/drivers/usb/usb-skeleton.c
@@ -325,9 +325,8 @@ retry:
rv = skel_do_read_io(dev, count);
if (rv < 0)
goto exit;
- else if (!(file->f_flags & O_NONBLOCK))
+ else
goto retry;
- rv = -EAGAIN;
}
exit:
mutex_unlock(&dev->io_mutex);