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cdrom: gdrom: initialize global variable at init time 

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@axentia.se>
Cc: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Peter Rosin <peda@axentia.se>
Link: https://lore.kernel.org/r/YJP2j6AU82MqEY2M@kroah.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2021-05-06 16:00:47 +02:00
parent 283cd246bc
commit 6f2e5eb825
1 changed files with 8 additions and 1 deletions
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9
drivers/cdrom/gdrom.c
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@ -740,6 +740,13 @@ static const struct blk_mq_ops gdrom_mq_ops = {
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_driver = {
static int __init init_gdrom(void)
{
int rc;
gd.toc = NULL;
rc = platform_driver_register(&gdrom_driver);
if (rc)
return rc;