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rpmsg: char: treat rpmsg_trysend() ENOMEM as EAGAIN

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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
This commit is contained in:
Tim Blechmann 2022-03-13 10:45:41 +08:00 committed by Bjorn Andersson
parent db64e7e74b
commit cbf58250b3
1 changed files with 5 additions and 2 deletions
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7
drivers/rpmsg/rpmsg_char.c
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@ -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);