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| author | Tejun Heo <tj@kernel.org> | 2010-05-19 15:38:58 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2010-05-25 19:41:16 -0400 |
| commit | e7ecd435692ca9bde9d124be30b3a26e672ea6c2 (patch) | |
| tree | 5587584952c37e2867a2e27b03b1accfbeab7a30 /drivers/ata | |
| parent | 9a7780c9acb821fe1c2b6fc53f74cc2556ff5364 (diff) | |
| download | linux-e7ecd435692ca9bde9d124be30b3a26e672ea6c2.tar.bz2 | |
libata: disable ATAPI AN by default
There are ATAPI devices which raise AN when hit by commands issued by
open(). This leads to infinite loop of AN -> MEDIA_CHANGE uevent ->
udev open() to check media -> AN.
Both ACS and SerialATA standards don't define in which case ATAPI
devices are supposed to raise or not raise AN. They both list media
insertion event as a possible use case for ATAPI ANs but there is no
clear description of what constitutes such events. As such, it seems
a bit too naive to export ANs directly to userland as MEDIA_CHANGE
events without further verification (which should behave similarly to
windows as it apparently is the only thing that some hardware vendors
are testing against).
This patch adds libata.atapi_an module parameter and disables ATAPI AN
by default for now.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Nick Bowler <nbowler@elliptictech.com>
Cc: David Zeuthen <david@fubar.dk>
Cc: stable@kernel.org
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/libata-core.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index c47373f01f89..8959f42c5b3b 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -160,6 +160,10 @@ int libata_allow_tpm = 0; module_param_named(allow_tpm, libata_allow_tpm, int, 0444); MODULE_PARM_DESC(allow_tpm, "Permit the use of TPM commands (0=off [default], 1=on)"); +static int atapi_an; +module_param(atapi_an, int, 0444); +MODULE_PARM_DESC(atapi_an, "Enable ATAPI AN media presence notification (0=0ff [default], 1=on)"); + MODULE_AUTHOR("Jeff Garzik"); MODULE_DESCRIPTION("Library module for ATA devices"); MODULE_LICENSE("GPL"); @@ -2510,7 +2514,8 @@ int ata_dev_configure(struct ata_device *dev) * to enable ATAPI AN to discern between PHY status * changed notifications and ATAPI ANs. */ - if ((ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) && + if (atapi_an && + (ap->flags & ATA_FLAG_AN) && ata_id_has_atapi_AN(id) && (!sata_pmp_attached(ap) || sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf) == 0)) { unsigned int err_mask; |