On 05/19/2010 09:38 AM, Tejun Heo wrote:
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@xxxxxxxxxx> Cc: Kay Sievers<kay.sievers@xxxxxxxx> Cc: Nick Bowler<nbowler@xxxxxxxxxxxxxxxx> Cc: David Zeuthen<david@xxxxxxxx> Cc: stable@xxxxxxxxxx --- drivers/ata/libata-core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
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