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scsi: esp: clean up handle_ti/esp_do_dma if s->do_cmd

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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 <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2016-06-15 14:29:33 +02:00
parent d020aa504c
commit 7f0b6e114a
1 changed files with 4 additions and 7 deletions
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11
hw/scsi/esp.c
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@ -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;
}
}