From: Vincent Bernat <vincent@bernat.im>
Date: Sat, 15 Aug 2015 12:07:44 +0000 (+0200)
Subject: 9p: fix return code of read() when count is 0
X-Git-Tag: omap-for-v4.3/fixes-rc1~81^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b5ac1fb2717e48177d3f73f9e4c9b556c0a24c6b;p=pandora-kernel.git

9p: fix return code of read() when count is 0

When reading 0 bytes from an empty file on a 9P filesystem, the return
code of read() was not 0 as expected due to an unitialized err variable.

Tested with this simple program:

    #include <assert.h>
    #include <sys/types.h>
    #include <sys/stat.h>
    #include <fcntl.h>
    #include <unistd.h>

    int main(int argc, const char **argv)
    {
        assert(argc == 2);
        char buffer[256];
        int fd = open(argv[1], O_RDONLY|O_NOCTTY);
        assert(fd >= 0);
        assert(read(fd, buffer, 0) == 0);
        return 0;
    }

Signed-off-by: Vincent Bernat <vincent@bernat.im>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
---

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