From b70b9ce914c5624549ab42cc68d8c703f5d90512 Mon Sep 17 00:00:00 2001
From: Michel Machado <michel@digirati.com.br>
Date: Sat, 31 Jan 2015 20:35:26 -0500
Subject: [PATCH] f3probe: improve I/O error handling

---
 libdevs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libdevs.c b/libdevs.c
index 8e9d04a..e9d9f34 100644
--- a/libdevs.c
+++ b/libdevs.c
@@ -320,7 +320,10 @@ static int read_all(int fd, char *buf, int count)
 	int done = 0;
 	do {
 		ssize_t rc = read(fd, buf + done, count - done);
-		assert(rc >= 0); /* Did the read() went right? */
+		if (rc < 0) {
+			assert(errno == EIO);
+			return errno;
+		}
 		assert(rc != 0); /* We should never hit the end of the file. */
 		done += rc;
 	} while (done < count);