]> git.ipfire.org Git - thirdparty/kernel/stable.git/commit
ata: libata-eh: Do not use ATAPI DMA for a device limited to PIO mode
authorNiklas Cassel <cassel@kernel.org>
Fri, 21 Feb 2025 01:54:23 +0000 (02:54 +0100)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 20 Apr 2025 08:15:19 +0000 (10:15 +0200)
commit04c0c555049fc7aec7c72011b5fe33c8f4b7a48a
tree8f909f2bfddd0c0b43b57717b5c8c1eff50a0e6f
parentccd97c8a4f90810f228ee40d1055148fa146dd57
ata: libata-eh: Do not use ATAPI DMA for a device limited to PIO mode

[ Upstream commit 91ec84f8eaddbc93d7c62e363d68aeb7b89879c7 ]

atapi_eh_request_sense() currently uses ATAPI DMA if the SATA controller
has ATA_FLAG_PIO_DMA (PIO cmds via DMA) set.

However, ATA_FLAG_PIO_DMA is a flag that can be set by a low-level driver
on a port at initialization time, before any devices are scanned.

If a controller detects a connected device that only supports PIO, we set
the flag ATA_DFLAG_PIO.

Modify atapi_eh_request_sense() to not use ATAPI DMA if the connected
device only supports PIO.

Reported-by: Philip Pemberton <lists@philpem.me.uk>
Closes: https://lore.kernel.org/linux-ide/c6722ee8-5e21-4169-af59-cbbae9edc02f@philpem.me.uk/
Tested-by: Philip Pemberton <lists@philpem.me.uk>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20250221015422.20687-2-cassel@kernel.org
Signed-off-by: Niklas Cassel <cassel@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/ata/libata-eh.c