scsi: zorro_esp: Limit DMA transfers to 65535 bytes

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The core driver, esp_scsi, does not use the ESP_CONFIG2_FENAB bit, so the
chip's Transfer Counter register is only 16 bits wide (not 24).  A larger
transfer cannot work and will theoretically result in a failed command
and a "DMA length is zero" error.

Fixes: 3109e5ae03 ("scsi: zorro_esp: New driver for Amiga Zorro NCR53C9x boards")
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Cc: Michael Schmitz <schmitzmic@gmail.com>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Reviewed-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

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Finn Thain 2018-10-16 16:31:25 +11:00 • committed by Martin K. Petersen

parent dfda5e21c9

commit b7ded0e8b0

1 changed files with 1 additions and 7 deletions

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drivers/scsi/zorro_esp.c

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