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am53c974: BLAST residual handling

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The am53c974 has an design issue where a single byte might be
left in the SCSI FIFO after a DMA transfer.
As the handling code is currently untested add a WARN_ON()
statement here.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke
2014-11-24 15:37:26 +01:00
committed by Christoph Hellwig
parent 3a7e7be2a9
commit 6df388f2d5
3 changed files with 36 additions and 0 deletions
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drivers/scsi/esp_scsi.h
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@@ -269,6 +269,7 @@ struct esp_cmd_entry {
#define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */
#define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */
#define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */
#define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */
u8 tag[2];
u8 orig_tag[2];