diff options
| -rw-r--r-- | util-linux/mdev.c | 41 |
1 files changed, 24 insertions, 17 deletions
diff --git a/util-linux/mdev.c b/util-linux/mdev.c index 84e72e2..79871d3 100644 --- a/util-linux/mdev.c +++ b/util-linux/mdev.c @@ -756,37 +756,45 @@ static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM, static void load_firmware(const char *firmware, const char *sysfs_path) { int cnt; - int firmware_fd, loading_fd, data_fd; + int firmware_fd, loading_fd; /* check for /lib/firmware/$FIRMWARE */ xchdir("/lib/firmware"); - firmware_fd = xopen(firmware, O_RDONLY); - - /* in case we goto out ... */ - data_fd = -1; + firmware_fd = open(firmware, O_RDONLY); /* can fail */ /* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */ xchdir(sysfs_path); for (cnt = 0; cnt < 30; ++cnt) { loading_fd = open("loading", O_WRONLY); - if (loading_fd != -1) + if (loading_fd >= 0) goto loading; sleep(1); } goto out; loading: - /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */ - if (full_write(loading_fd, "1", 1) != 1) - goto out; - - /* load firmware into /sys/$DEVPATH/data */ - data_fd = open("data", O_WRONLY); - if (data_fd == -1) - goto out; - cnt = bb_copyfd_eof(firmware_fd, data_fd); + cnt = 0; + if (firmware_fd >= 0) { + int data_fd; + + /* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */ + if (full_write(loading_fd, "1", 1) != 1) + goto out; + + /* load firmware into /sys/$DEVPATH/data */ + data_fd = open("data", O_WRONLY); + if (data_fd < 0) + goto out; + cnt = bb_copyfd_eof(firmware_fd, data_fd); + if (ENABLE_FEATURE_CLEAN_UP) + close(data_fd); + } - /* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */ + /* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" + * Note: we emit -1 also if firmware file wasn't found. + * There are cases when otherwise kernel would wait for minutes + * before timing out. + */ if (cnt > 0) full_write(loading_fd, "0", 1); else @@ -796,7 +804,6 @@ static void load_firmware(const char *firmware, const char *sysfs_path) if (ENABLE_FEATURE_CLEAN_UP) { close(firmware_fd); close(loading_fd); - close(data_fd); } } |