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um: virtio: fix handling of messages without payload

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If we have a message without payload, we call full_read() with
len set to 0, which causes it to return -ECONNRESET. Catch this
case and explicitly return 0 for it so we can actually use the
zero-size config-changed message.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Johannes Berg 2020-12-15 10:52:22 +01:00 • committed by Richard Weinberger
parent 74e919d230
commit 10c2b5aeb2
1 changed files with 3 additions and 0 deletions
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3
arch/um/drivers/virtio_uml.c
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@ -97,6 +97,9 @@ static int full_read(int fd, void *buf, int len, bool abortable)
{
int rc;
if (!len)
return 0;
do {
rc = os_read_file(fd, buf, len);
if (rc > 0) {