error: Avoid unnecessary error_propagate() after error_setg()

Replace

    error_setg(&err, ...);
    error_propagate(errp, err);

by

    error_setg(errp, ...);

Related pattern:

    if (...) {
        error_setg(&err, ...);
        goto out;
    }
    ...
 out:
    error_propagate(errp, err);
    return;

When all paths to label out are that way, replace by

    if (...) {
        error_setg(errp, ...);
        return;
    }

and delete the label along with the error_propagate().

When we have at most one other path that actually needs to propagate,
and maybe one at the end that where propagation is unnecessary, e.g.

    foo(..., &err);
    if (err) {
        goto out;
    }
    ...
    bar(..., &err);
 out:
    error_propagate(errp, err);
    return;

move the error_propagate() to where it's needed, like

    if (...) {
        foo(..., &err);
        error_propagate(errp, err);
        return;
    }
    ...
    bar(..., errp);
    return;

and transform the error_setg() as above.

In some places, the transformation results in obviously unnecessary
error_propagate().  The next few commits will eliminate them.

Bonus: the elimination of gotos will make later patches in this series
easier to review.

Candidates for conversion tracked down with this Coccinelle script:

    @@
    identifier err, errp;
    expression list args;
    @@
    -    error_setg(&err, args);
    +    error_setg(errp, args);
         ... when != err
         error_propagate(errp, err);

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20200707160613.848843-34-armbru@redhat.com>

1 files changed, 6 insertions, 8 deletions

diff --git a/hw/acpi/core.c b/hw/acpi/core.c
index 45cbed4..8b240c3 100644
--- a/hw/acpi/core.c
+++ b/hw/acpi/core.c
@@ -257,13 +257,13 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         goto out;
     }
     if (hdrs->has_file == hdrs->has_data) {
-        error_setg(&err, "'-acpitable' requires one of 'data' or 'file'");
+        error_setg(errp, "'-acpitable' requires one of 'data' or 'file'");
         goto out;
     }
 
     pathnames = g_strsplit(hdrs->has_file ? hdrs->file : hdrs->data, ":", 0);
     if (pathnames == NULL || pathnames[0] == NULL) {
-        error_setg(&err, "'-acpitable' requires at least one pathname");
+        error_setg(errp, "'-acpitable' requires at least one pathname");
         goto out;
     }
 
@@ -272,7 +272,7 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         int fd = open(*cur, O_RDONLY | O_BINARY);
 
         if (fd < 0) {
-            error_setg(&err, "can't open file %s: %s", *cur, strerror(errno));
+            error_setg(errp, "can't open file %s: %s", *cur, strerror(errno));
             goto out;
         }
 
@@ -288,8 +288,8 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
                 memcpy(blob + bloblen, data, r);
                 bloblen += r;
             } else if (errno != EINTR) {
-                error_setg(&err, "can't read file %s: %s",
-                           *cur, strerror(errno));
+                error_setg(errp, "can't read file %s: %s", *cur,
+                           strerror(errno));
                 close(fd);
                 goto out;
             }
@@ -298,14 +298,12 @@ void acpi_table_add(const QemuOpts *opts, Error **errp)
         close(fd);
     }
 
-    acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, &err);
+    acpi_table_install(blob, bloblen, hdrs->has_file, hdrs, errp);
 
 out:
     g_free(blob);
     g_strfreev(pathnames);
     qapi_free_AcpiTableOptions(hdrs);
-
-    error_propagate(errp, err);
 }
 
 unsigned acpi_table_len(void *current)