[Bug 49151] NULL pointer dereference in pata_acpi

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https://bugzilla.kernel.org/show_bug.cgi?id=49151





--- Comment #45 from Aaron Lu <aaron.lu@xxxxxxxxx>  2012-11-29 02:22:11 ---
Created an attachment (id=87661)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=87661)
Fix ata_dma_enabled

Hi all,

After another thought, 0 is actually not a valid dma mode either, so probably
we should fix ata_dma_enabled instead of setting 0xff beforehand.

Attached a new patch for test, sorry for the trouble.

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