From: Paolo Bonzini Date: Wed, 15 Jun 2016 14:29:33 +0200 Subject: [PATCH] scsi: esp: clean up handle_ti/esp_do_dma if s->do_cmd Avoid duplicated code between esp_do_dma and handle_ti. esp_do_dma has the same code that handle_ti contains after the call to esp_do_dma; but the code in handle_ti is never reached because it is in an "else if". Remove the else and also the pointless return. esp_do_dma also has a partially dead assignment of the to_device variable. Sink it to the point where it's actually used. Finally, assert that the other caller of esp_do_dma (esp_transfer_data) only transfers data and not a command. This is true because get_cmd cancels the old request synchronously before its caller handle_satn_stop sets do_cmd to 1. Reviewed-by: Laszlo Ersek Signed-off-by: Paolo Bonzini (cherry picked from commit 7f0b6e114ae4e142e2b3dfc9fac138f4a30edc4f) --- hw/scsi/esp.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-) diff --git a/hw/scsi/esp.c b/hw/scsi/esp.c index 6407844..68d3e4d 100644 --- a/hw/scsi/esp.c +++ b/hw/scsi/esp.c @@ -245,15 +245,10 @@ static void esp_do_dma(ESPState *s) uint32_t len; int to_device; - to_device = (s->ti_size < 0); len = s->dma_left; if (s->do_cmd) { trace_esp_do_dma(s->cmdlen, len); s->dma_memory_read(s->dma_opaque, &s->cmdbuf[s->cmdlen], len); - s->ti_size = 0; - s->cmdlen = 0; - s->do_cmd = 0; - do_cmd(s, s->cmdbuf); return; } if (s->async_len == 0) { @@ -263,6 +258,7 @@ static void esp_do_dma(ESPState *s) if (len > s->async_len) { len = s->async_len; } + to_device = (s->ti_size < 0); if (to_device) { s->dma_memory_read(s->dma_opaque, s->async_buf, len); } else { @@ -318,6 +314,7 @@ void esp_transfer_data(SCSIRequest *req, uint32_t len) { ESPState *s = req->hba_private; + assert(!s->do_cmd); trace_esp_transfer_data(s->dma_left, s->ti_size); s->async_len = len; s->async_buf = scsi_req_get_buf(req); @@ -358,13 +355,13 @@ static void handle_ti(ESPState *s) s->dma_left = minlen; s->rregs[ESP_RSTAT] &= ~STAT_TC; esp_do_dma(s); - } else if (s->do_cmd) { + } + if (s->do_cmd) { trace_esp_handle_ti_cmd(s->cmdlen); s->ti_size = 0; s->cmdlen = 0; s->do_cmd = 0; do_cmd(s, s->cmdbuf); - return; } }