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esp_scsi: read status registers 

A read to ESP_INTRPT will clear ESP_STATUS and ESP_SSTEP. So read
all status registers in one go to avoid losing information.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2014-11-24 15:37:23 +01:00 committed by Christoph Hellwig
parent 1af6f60368
commit 9535fff3c5
1 changed files with 5 additions and 3 deletions
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8
drivers/scsi/esp_scsi.c
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@ -982,7 +982,6 @@ static int esp_check_spur_intr(struct esp *esp)
default:
if (!(esp->sreg & ESP_STAT_INTR)) {
esp->ireg = esp_read8(ESP_INTRPT);
if (esp->ireg & ESP_INTR_SR)
return 1;
@ -2056,7 +2055,12 @@ static void __esp_interrupt(struct esp *esp)
int finish_reset, intr_done;
u8 phase;
/*
* Once INTRPT is read STATUS and SSTEP are cleared.
*/
esp->sreg = esp_read8(ESP_STATUS);
esp->seqreg = esp_read8(ESP_SSTEP);
esp->ireg = esp_read8(ESP_INTRPT);
if (esp->flags & ESP_FLAG_RESETTING) {
finish_reset = 1;
@ -2069,8 +2073,6 @@ static void __esp_interrupt(struct esp *esp)
return;
}
esp->ireg = esp_read8(ESP_INTRPT);
if (esp->ireg & ESP_INTR_SR)
finish_reset = 1;