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cdrom: don't attempt to fiddle with cdo->capability

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[ Upstream commit 8f94004e2a ]

We can't modify cdo->capability as it is defined as a const.
Change the modification hack to just WARN_ON_ONCE() if we hit
any of the invalid combinations.

This fixes a regression for pcd, which doesn't work after the
constify patch.

Fixes: 853fe1bf75 ("cdrom: Make device operations read-only")
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jens Axboe 2018-10-14 13:20:48 -06:00 committed by Greg Kroah-Hartman
parent 9070aed767
commit 4da708e823
1 changed files with 13 additions and 14 deletions
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27
drivers/cdrom/cdrom.c
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@ -410,10 +410,10 @@ static int cdrom_get_disc_info(struct cdrom_device_info *cdi,
* hack to have the capability flags defined const, while we can still
* change it here without gcc complaining at every line.
*/
#define ENSURE(call, bits) \
do { \
if (cdo->call == NULL) \
*change_capability &= ~(bits); \
#define ENSURE(cdo, call, bits) \
do { \
if (cdo->call == NULL) \
WARN_ON_ONCE((cdo)->capability & (bits)); \
} while (0)
/*
@ -589,7 +589,6 @@ int register_cdrom(struct cdrom_device_info *cdi)
{
static char banner_printed;
const struct cdrom_device_ops *cdo = cdi->ops;
int *change_capability = (int *)&cdo->capability; /* hack */
cd_dbg(CD_OPEN, "entering register_cdrom\n");
@ -601,16 +600,16 @@ int register_cdrom(struct cdrom_device_info *cdi)
cdrom_sysctl_register();
}
ENSURE(drive_status, CDC_DRIVE_STATUS);
ENSURE(cdo, drive_status, CDC_DRIVE_STATUS);
if (cdo->check_events == NULL && cdo->media_changed == NULL)
*change_capability = ~(CDC_MEDIA_CHANGED | CDC_SELECT_DISC);
ENSURE(tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
ENSURE(lock_door, CDC_LOCK);
ENSURE(select_speed, CDC_SELECT_SPEED);
ENSURE(get_last_session, CDC_MULTI_SESSION);
ENSURE(get_mcn, CDC_MCN);
ENSURE(reset, CDC_RESET);
ENSURE(generic_packet, CDC_GENERIC_PACKET);
WARN_ON_ONCE(cdo->capability & (CDC_MEDIA_CHANGED | CDC_SELECT_DISC));
ENSURE(cdo, tray_move, CDC_CLOSE_TRAY | CDC_OPEN_TRAY);
ENSURE(cdo, lock_door, CDC_LOCK);
ENSURE(cdo, select_speed, CDC_SELECT_SPEED);
ENSURE(cdo, get_last_session, CDC_MULTI_SESSION);
ENSURE(cdo, get_mcn, CDC_MCN);
ENSURE(cdo, reset, CDC_RESET);
ENSURE(cdo, generic_packet, CDC_GENERIC_PACKET);
cdi->mc_flags = 0;
cdi->options = CDO_USE_FFLAGS;