tree 767cad4cafccce7c606003088ead281b70477fe3
parent ea9c717d0148d4194f9bd04ecfa6b59b20fc0a08
author Maciej Sosnowski <maciej.sosnowski@intel.com> 1235642694 +0100
committer Dan Williams <dan.j.williams@intel.com> 1236207879 -0700

I/OAT: fail initialization on zero channels detection

On some systems with I/OAT ver.2 when DCA is disabled in BIOS
situations have been observed
that zero DMA channels are detected instead of four.
To avoid kernel panic driver should fail gracefully with appropriate message.

Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>