scsi: g_NCR5380: End PDMA transfer correctly on target disconnection

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When an IRQ arrives during PDMA transfer, pread() and pwrite() return
without waiting for the 53C80 registers to be ready and this ends up
messing up the chip state. This was observed with SONY CDU-55S which is
slow enough to disconnect during 4096-byte reads.

IRQ during PDMA is not an error so don't return -1. Instead, store the
remaining byte count for use by NCR5380_dma_residual().

[Poll for the BASR_END_DMA_TRANSFER condition rather than remove the
error message -- F.T.]

Signed-off-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

...

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Ondrej Zary 2017-07-03 03:59:05 -04:00 • committed by Martin K. Petersen

parent 12b859b706

commit e9dbadf788

1 changed files with 31 additions and 17 deletions

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drivers/scsi/g_NCR5380.c

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