Commit cbf58250 authored Mar 13, 2022 by Tim Blechmann Committed by Bjorn Andersson Mar 13, 2022

rpmsg: char: treat rpmsg_trysend() ENOMEM as EAGAIN



rpmsg_trysend() returns -ENOMEM when no rpmsg buffer can be allocated.
this causes write to fail with this error as opposed to -EAGAIN.
this is what user space applications (and libraries like boost.asio)
would expect when using normal character devices.

Signed-off-by: Tim Blechmann <tim@klingt.org>
Cc: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220313024541.1579848-2-tim@klingt.org

parent db64e7e7

drivers/rpmsg/rpmsg_char.c

+5 −2

Original line number	Diff line number	Diff line
		@@ -242,10 +242,13 @@ static ssize_t rpmsg_eptdev_write_iter(struct kiocb *iocb,
		goto unlock_eptdev;
		}

		if (filp->f_flags & O_NONBLOCK)
		if (filp->f_flags & O_NONBLOCK) {
		ret = rpmsg_trysendto(eptdev->ept, kbuf, len, eptdev->chinfo.dst);
		else
		if (ret == -ENOMEM)
		ret = -EAGAIN;
		} else {
		ret = rpmsg_sendto(eptdev->ept, kbuf, len, eptdev->chinfo.dst);
		}

		unlock_eptdev:
		mutex_unlock(&eptdev->ept_lock);