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scsi: zorro_esp: Limit DMA transfers to 65535 bytes 

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>
This commit is contained in:
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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8
drivers/scsi/zorro_esp.c
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@ -221,7 +221,7 @@ static int fastlane_esp_irq_pending(struct esp *esp)
static u32 zorro_esp_dma_length_limit(struct esp *esp, u32 dma_addr,
u32 dma_len)
{
return dma_len > 0xFFFFFF ? 0xFFFFFF : dma_len;
return dma_len > 0xFFFF ? 0xFFFF : dma_len;
}
static void zorro_esp_reset_dma(struct esp *esp)
@ -460,7 +460,6 @@ static void zorro_esp_send_blz1230_dma_cmd(struct esp *esp, u32 addr,
scsi_esp_cmd(esp, ESP_CMD_DMA);
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
scsi_esp_cmd(esp, cmd);
}
@ -505,7 +504,6 @@ static void zorro_esp_send_blz1230II_dma_cmd(struct esp *esp, u32 addr,
scsi_esp_cmd(esp, ESP_CMD_DMA);
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
scsi_esp_cmd(esp, cmd);
}
@ -550,7 +548,6 @@ static void zorro_esp_send_blz2060_dma_cmd(struct esp *esp, u32 addr,
scsi_esp_cmd(esp, ESP_CMD_DMA);
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
scsi_esp_cmd(esp, cmd);
}
@ -575,7 +572,6 @@ static void zorro_esp_send_cyber_dma_cmd(struct esp *esp, u32 addr,
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
if (write) {
/* DMA receive */
@ -625,7 +621,6 @@ static void zorro_esp_send_cyberII_dma_cmd(struct esp *esp, u32 addr,
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
if (write) {
/* DMA receive */
@ -667,7 +662,6 @@ static void zorro_esp_send_fastlane_dma_cmd(struct esp *esp, u32 addr,
zorro_esp_write8(esp, (esp_count >> 0) & 0xff, ESP_TCLOW);
zorro_esp_write8(esp, (esp_count >> 8) & 0xff, ESP_TCMED);
zorro_esp_write8(esp, (esp_count >> 16) & 0xff, ESP_TCHI);
if (write) {
/* DMA receive */