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Subject[PATCH v3 2/6] esp_scsi: Track residual for PIO transfers
Date
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>
---
Changed since v2:
- Declare send_cmd_residual as u32 instead of int.
---
drivers/scsi/esp_scsi.c | 1 +
drivers/scsi/esp_scsi.h | 2 ++
drivers/scsi/mac_esp.c | 2 ++
3 files changed, 5 insertions(+)

diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index c3fc34b9964d..9e5d3f7d29ae 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -1338,6 +1338,7 @@ static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,

bytes_sent = esp->data_dma_len;
bytes_sent -= ecount;
+ bytes_sent -= esp->send_cmd_residual;

/*
* The am53c974 has a DMA 'pecularity'. The doc states:
diff --git a/drivers/scsi/esp_scsi.h b/drivers/scsi/esp_scsi.h
index 8163dca2071b..a77772777a30 100644
--- a/drivers/scsi/esp_scsi.h
+++ b/drivers/scsi/esp_scsi.h
@@ -540,6 +540,8 @@ struct esp {

void *dma;
int dmarev;
+
+ u32 send_cmd_residual;
};

/* A front-end driver for the ESP chip should do the following in
diff --git a/drivers/scsi/mac_esp.c b/drivers/scsi/mac_esp.c
index eb551f3cc471..71879f2207e0 100644
--- a/drivers/scsi/mac_esp.c
+++ b/drivers/scsi/mac_esp.c
@@ -427,6 +427,8 @@ static void mac_esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
scsi_esp_cmd(esp, ESP_CMD_TI);
}
}
+
+ esp->send_cmd_residual = esp_count;
}

static int mac_esp_irq_pending(struct esp *esp)
--
2.18.1
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