Re: [PATCH 01/19] ata: libata-core: Fix ata_port_request_pm() locking

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On 9/11/23 06:01, Damien Le Moal wrote:
The function ata_port_request_pm() checks the port flag
ATA_PFLAG_PM_PENDING and calls ata_port_wait_eh() if this flag is set to
ensure that power management operations for a port are not secheduled
simultaneously. However, this flag check is done without holding the
port lock.

Fix this by taking the port lock on entry to the function and checking
the flag under this lock. The lock is released and re-taken if
ata_port_wait_eh() needs to be called.

Fixes: 5ef41082912b ("ata: add ata port system PM callbacks")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
  drivers/ata/libata-core.c | 17 +++++++++--------
  1 file changed, 9 insertions(+), 8 deletions(-)

Reviewed-by: Hannes Reinecke <hare@xxxxxxx>


Dr. Hannes Reinecke                Kernel Storage Architect
hare@xxxxxxx                              +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Ivo Totev, Andrew
Myers, Andrew McDonald, Martje Boudien Moerman

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