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mdev: tell kernel that we didn't find the firmware
function old new delta mdev_main 797 801 +4 Signed-off-by: Christoph Lohmann <20h@r-36.net> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
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@ -756,37 +756,45 @@ static int FAST_FUNC dirAction(const char *fileName UNUSED_PARAM,
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static void load_firmware(const char *firmware, const char *sysfs_path)
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{
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int cnt;
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int firmware_fd, loading_fd, data_fd;
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int firmware_fd, loading_fd;
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/* check for /lib/firmware/$FIRMWARE */
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xchdir("/lib/firmware");
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firmware_fd = xopen(firmware, O_RDONLY);
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/* in case we goto out ... */
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data_fd = -1;
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firmware_fd = open(firmware, O_RDONLY); /* can fail */
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/* check for /sys/$DEVPATH/loading ... give 30 seconds to appear */
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xchdir(sysfs_path);
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for (cnt = 0; cnt < 30; ++cnt) {
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loading_fd = open("loading", O_WRONLY);
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if (loading_fd != -1)
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if (loading_fd >= 0)
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goto loading;
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sleep(1);
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}
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goto out;
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loading:
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/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
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if (full_write(loading_fd, "1", 1) != 1)
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goto out;
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cnt = 0;
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if (firmware_fd >= 0) {
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int data_fd;
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/* load firmware into /sys/$DEVPATH/data */
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data_fd = open("data", O_WRONLY);
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if (data_fd == -1)
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goto out;
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cnt = bb_copyfd_eof(firmware_fd, data_fd);
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/* tell kernel we're loading by "echo 1 > /sys/$DEVPATH/loading" */
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if (full_write(loading_fd, "1", 1) != 1)
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goto out;
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/* tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading" */
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/* load firmware into /sys/$DEVPATH/data */
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data_fd = open("data", O_WRONLY);
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if (data_fd < 0)
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goto out;
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cnt = bb_copyfd_eof(firmware_fd, data_fd);
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if (ENABLE_FEATURE_CLEAN_UP)
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close(data_fd);
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}
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/* Tell kernel result by "echo [0|-1] > /sys/$DEVPATH/loading"
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* Note: we emit -1 also if firmware file wasn't found.
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* There are cases when otherwise kernel would wait for minutes
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* before timing out.
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*/
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if (cnt > 0)
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full_write(loading_fd, "0", 1);
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else
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@ -796,7 +804,6 @@ static void load_firmware(const char *firmware, const char *sysfs_path)
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if (ENABLE_FEATURE_CLEAN_UP) {
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close(firmware_fd);
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close(loading_fd);
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close(data_fd);
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}
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}
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