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| author | Finn Thain <fthain@telegraphics.com.au> | 2018-10-16 07:31:25 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-18 03:34:20 +0200 |
| commit | fd47d919d0c336e7c22862b51ee94927ffea227a (patch) | |
| tree | 08caf71e10f8c000181ab8fe75fe1aac97f316f3 /drivers/scsi/esp_scsi.h | |
| parent | scsi: zorro_esp: Limit DMA transfers to 65535 bytes (diff) | |
| download | linux-fd47d919d0c336e7c22862b51ee94927ffea227a.tar.xz linux-fd47d919d0c336e7c22862b51ee94927ffea227a.zip | |
scsi: esp_scsi: Track residual for PIO transfers
If a target disconnects during a PIO data transfer the command may fail
when the target reconnects:
scsi host1: DMA length is zero!
scsi host1: cur adr[04380000] len[00000000]
The scsi bus is then reset. This happens because the residual reached
zero before the transfer was completed.
The usual residual calculation relies on the Transfer Count registers.
That works for DMA transfers but not for PIO transfers. Fix the problem
by storing the PIO transfer residual and using that to correctly
calculate bytes_sent.
Fixes: 6fe07aaffbf0 ("[SCSI] m68k: new mac_esp scsi driver")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Tested-by: Michael Schmitz <schmitzmic@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/esp_scsi.h')
| -rw-r--r-- | drivers/scsi/esp_scsi.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h index 3b1b501e76f9..8062b536cbff 100644 --- a/drivers/scsi/esp_scsi.h +++ b/drivers/scsi/esp_scsi.h @@ -524,6 +524,8 @@ struct esp { void *dma; int dmarev; + + u32 send_cmd_residual; }; /* A front-end driver for the ESP chip should do the following in |