[Skiboot] [PATCH] Fixes for compilation with -Werror

[Frédéric Bonnard]

From: Frederic Bonnard <frediz at linux.vnet.ibm.com>

On Debian/Ubuntu, additionnal compilation flags are added such as -Werror which make
compilation fail. So :
- checking function return codes so that the compilation doesn't fail.
- moving 'largest' variable so that gcc always sees it with a value.

Signed-off-by: Frederic Bonnard <frediz at linux.vnet.ibm.com>
---
 external/gard/gard.c         |  4 +---
 external/opal-prd/opal-prd.c | 32 +++++++++++++++++++++++++++-----
 external/opal-prd/pnor.c     | 14 ++++++++++++--
 3 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/external/gard/gard.c b/external/gard/gard.c
index c43e05a..93a1c07 100644
--- a/external/gard/gard.c
+++ b/external/gard/gard.c
@@ -511,7 +511,7 @@ static int do_show(struct gard_ctx *ctx, int argc, char **argv)
 
 static int do_clear_i(struct gard_ctx *ctx, int pos, struct gard_record *gard, void *priv)
 {
-	int largest, rc = 0;
+	int largest = 0, rc = 0;
 	char *buf;
 	struct gard_record null_gard;
 
@@ -533,8 +533,6 @@ static int do_clear_i(struct gard_ctx *ctx, int pos, struct gard_record *gard, v
 			return rc;
 		}
 		printf("done\n");
-
-		largest = 0;
 	} else if (be32toh(gard->record_id) == *(uint32_t *)priv) {
 		largest = get_largest_pos(ctx);
 		if (largest < 0 || pos > largest) {
diff --git a/external/opal-prd/opal-prd.c b/external/opal-prd/opal-prd.c
index bf8f2ae..9f686c5 100644
--- a/external/opal-prd/opal-prd.c
+++ b/external/opal-prd/opal-prd.c
@@ -707,7 +707,12 @@ static void dump_hbrt_map(struct opal_prd_ctx *ctx)
 		return;
 	}
 
-	ftruncate(fd, 0);
+	rc = ftruncate(fd, 0);
+	if (rc < 0) {
+		pr_log(LOG_NOTICE, "IMAGE: couldn't truncate image %s for writing",
+				dump_name);
+		return;
+	}
 	rc = write(fd, ctx->code_addr, ctx->code_size);
 	close(fd);
 
@@ -772,8 +777,18 @@ static int prd_init_one_range(struct opal_prd_ctx *ctx, const char *path,
 	__be64 *reg;
 	void *buf;
 
-	asprintf(&label_path, "%s/%s/ibm,prd-label", path, dirent->d_name);
-	asprintf(&reg_path, "%s/%s/reg", path, dirent->d_name);
+	rc = asprintf(&label_path, "%s/%s/ibm,prd-label", path, dirent->d_name);
+	if (rc < 0) {
+		pr_log(LOG_ERR, "FW: error creating 'ibm,prd-label' path "
+				"node: %m");
+		return -1;
+	}
+	rc = asprintf(&reg_path, "%s/%s/reg", path, dirent->d_name);
+	if (rc < 0) {
+		pr_log(LOG_ERR, "FW: error creating 'reg' path "
+				" node: %m");
+		return -1;
+	}
 
 	reg = NULL;
 	label = NULL;
@@ -823,9 +838,16 @@ static int prd_init_ranges(struct opal_prd_ctx *ctx)
 	struct dirent *dirent;
 	char *path;
 	DIR *dir;
-	int rc = -1;
+	int rc;
 
-	asprintf(&path, "%s/reserved-memory", devicetree_base);
+	rc = asprintf(&path, "%s/reserved-memory", devicetree_base);
+	if (rc < 0) {
+		pr_log(LOG_ERR, "FW: error creating 'reserved-memory' path "
+				"node: %m");
+		return -1;
+	}
+
+	rc = -1;
 
 	dir = opendir(path);
 	if (!dir) {
diff --git a/external/opal-prd/pnor.c b/external/opal-prd/pnor.c
index 95a4aa5..43814ab 100644
--- a/external/opal-prd/pnor.c
+++ b/external/opal-prd/pnor.c
@@ -139,7 +139,12 @@ static int mtd_write(struct pnor *pnor, int fd, void *data, uint64_t offset,
 			goto out;
 		}
 
-		read(fd, buf, pnor->erasesize);
+		rc = read(fd, buf, pnor->erasesize);
+		if (rc < 0) {
+			pr_log(LOG_ERR, "PNOR: read(0x%x bytes) failed: %m",
+					pnor->erasesize);
+			goto out;
+		}
 	}
 
 	if (end_waste)  {
@@ -154,7 +159,12 @@ static int mtd_write(struct pnor *pnor, int fd, void *data, uint64_t offset,
 			goto out;
 		}
 
-		read(fd, buf + write_len - pnor->erasesize, pnor->erasesize);
+		rc = read(fd, buf + write_len - pnor->erasesize, pnor->erasesize);
+		if (rc < 0) {
+			pr_log(LOG_ERR, "PNOR: read(0x%x bytes) failed: %m",
+					pnor->erasesize);
+			goto out;
+		}
 	}
 
 	/* Put data in the correct spot */
-- 
1.9.1