Commit af34d637 authored by David Milburn's avatar David Milburn Committed by Tejun Heo
Browse files

libata: add ATA_HORKAGE_MAX_SEC_1024 to revert back to previous max_sectors limit 



Since no longer limiting max_sectors to BLK_DEF_MAX_SECTORS (commit 34b48db6),
data corruption may occur on ST380013AS drive configured on 82801JI (ICH10 Family)
SATA controller. This patch will allow the driver to limit max_sectors as before

 # cat /sys/block/sdb/queue/max_sectors_kb
 512

I was able to double the max_sectors_kb value up to 16384 on linux-4.2.0-rc2
before seeing corruption, but seems safer to use previous limit. Without this
patch max_sectors_kb will be 32767.

tj: Minor comment update.

Reported-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarDavid Milburn <dmilburn@redhat.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org # v3.19 and later
Fixes: 34b48db6 ("block: remove artifical max_hw_sectors cap")
parent cda57b1b

drivers/ata/libata-core.c

+10 −0
Original line number Diff line number Diff line
@@ -2478,6 +2478,10 @@ int ata_dev_configure(struct ata_device *dev) 
		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,

					 dev->max_sectors);



	if (dev->horkage & ATA_HORKAGE_MAX_SEC_1024)

		dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_1024,

					 dev->max_sectors);



	if (dev->horkage & ATA_HORKAGE_MAX_SEC_LBA48)

		dev->max_sectors = ATA_MAX_SECTORS_LBA48;
@@ -4146,6 +4150,12 @@ static const struct ata_blacklist_entry ata_device_blacklist [] = { 
	{ "Slimtype DVD A  DS8A8SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },

	{ "Slimtype DVD A  DS8A9SH", NULL,	ATA_HORKAGE_MAX_SEC_LBA48 },



	/*

	 * Causes silent data corruption with higher max sects.

	 * http://lkml.kernel.org/g/x49wpy40ysk.fsf@segfault.boston.devel.redhat.com

	 */

	{ "ST380013AS",		"3.20",		ATA_HORKAGE_MAX_SEC_1024 },



	/* Devices we expect to fail diagnostics */



	/* Devices where NCQ should be avoided */

include/linux/ata.h

+1 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ enum { 
	ATA_SECT_SIZE		= 512,

	ATA_MAX_SECTORS_128	= 128,

	ATA_MAX_SECTORS		= 256,

	ATA_MAX_SECTORS_1024    = 1024,

	ATA_MAX_SECTORS_LBA48	= 65535,/* TODO: 65536? */

	ATA_MAX_SECTORS_TAPE	= 65535,

include/linux/libata.h

+1 −1
Original line number Diff line number Diff line
@@ -432,7 +432,7 @@ enum { 
	ATA_HORKAGE_ZERO_AFTER_TRIM = (1 << 22),/* guarantees zero after trim */

	ATA_HORKAGE_NO_NCQ_LOG	= (1 << 23),	/* don't use NCQ for log read */

	ATA_HORKAGE_NOTRIM	= (1 << 24),	/* don't use TRIM */



	ATA_HORKAGE_MAX_SEC_1024 = (1 << 25),	/* Limit max sects to 1024 */



	 /* DMA mask for user DMA control: User visible values; DO NOT

	    renumber */

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