From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> commit 9183f01b5e6e32eb3f17b5f3f8d5ad5ac9786c49 upstream. As Peter points out, if we were to disconnect and then reconnect this driver from a device, the "global" state of the device would contain odd values and could cause problems. Fix this up by just initializing the whole thing to 0 at probe() time. Ideally this would be a per-device variable, but given the age and the total lack of users of it, that would require a lot of s/./->/g changes for really no good reason. Reported-by: Peter Rosin <peda@xxxxxxxxxx> Cc: Jens Axboe <axboe@xxxxxxxxx> Reviewed-by: Peter Rosin <peda@xxxxxxxxxx> Link: https://lore.kernel.org/r/YJP2j6AU82MqEY2M@xxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/cdrom/gdrom.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- a/drivers/cdrom/gdrom.c +++ b/drivers/cdrom/gdrom.c @@ -740,6 +740,13 @@ static const struct blk_mq_ops gdrom_mq_ static int probe_gdrom(struct platform_device *devptr) { int err; + + /* + * Ensure our "one" device is initialized properly in case of previous + * usages of it + */ + memset(&gd, 0, sizeof(gd)); + /* Start the device */ if (gdrom_execute_diagnostic() != 1) { pr_warning("ATA Probe for GDROM failed\n"); @@ -845,7 +852,7 @@ static struct platform_driver gdrom_driv static int __init init_gdrom(void) { int rc; - gd.toc = NULL; + rc = platform_driver_register(&gdrom_driver); if (rc) return rc;
