[PATCH 01/30] migration/channel-block: fix return value for qio_channel_block_{readv, writev}

From: Juan Quintela <quintela@redhat.com>
To: qemu-devel@nongnu.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"David Hildenbrand" <david@redhat.com>,
	"Laurent Vivier" <laurent@vivier.eu>,
	"Stefan Hajnoczi" <stefanha@redhat.com>,
	"Fam Zheng" <fam@euphon.net>,
	qemu-block@nongnu.org,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	"Thomas Huth" <thuth@redhat.com>,
	"Philippe Mathieu-Daudé" <philmd@linaro.org>,
	qemu-trivial@nongnu.org, "Michael Tokarev" <mjt@tls.msk.ru>,
	"Daniel P. Berrangé" <berrange@redhat.com>,
	"Marc-André Lureau" <marcandre.lureau@redhat.com>,
	"Peter Xu" <peterx@redhat.com>,
	"Juan Quintela" <quintela@redhat.com>,
	"Fiona Ebner" <f.ebner@proxmox.com>
Subject: [PATCH 01/30] migration/channel-block: fix return value for qio_channel_block_{readv, writev}
Date: Tue, 15 Nov 2022 13:11:57 +0100	[thread overview]
Message-ID: <20221115121226.26609-2-quintela@redhat.com> (raw)
In-Reply-To: <20221115121226.26609-1-quintela@redhat.com>

From: Fiona Ebner <f.ebner@proxmox.com>

in the error case. The documentation in include/io/channel.h states
that -1 or QIO_CHANNEL_ERR_BLOCK should be returned upon error. Simply
passing along the return value from the bdrv-functions has the
potential to confuse the call sides. Non-blocking mode is not
implemented currently, so -1 it is.

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 migration/channel-block.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/migration/channel-block.c b/migration/channel-block.c
index c55c8c93ce..f4ab53acdb 100644
--- a/migration/channel-block.c
+++ b/migration/channel-block.c
@@ -62,7 +62,8 @@ qio_channel_block_readv(QIOChannel *ioc,
     qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov);
     ret = bdrv_readv_vmstate(bioc->bs, &qiov, bioc->offset);
     if (ret < 0) {
-        return ret;
+        error_setg_errno(errp, -ret, "bdrv_readv_vmstate failed");
+        return -1;
     }
 
     bioc->offset += qiov.size;
@@ -86,7 +87,8 @@ qio_channel_block_writev(QIOChannel *ioc,
     qemu_iovec_init_external(&qiov, (struct iovec *)iov, niov);
     ret = bdrv_writev_vmstate(bioc->bs, &qiov, bioc->offset);
     if (ret < 0) {
-        return ret;
+        error_setg_errno(errp, -ret, "bdrv_writev_vmstate failed");
+        return -1;
     }
 
     bioc->offset += qiov.size;
-- 
2.38.1


