From 9535fff3c5f9382b46f656c46a80bc190645dd32 Mon Sep 17 00:00:00 2001 From: Hannes Reinecke Date: Mon, 24 Nov 2014 15:37:23 +0100 Subject: [PATCH] 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 Acked-by: David S. Miller Signed-off-by: Hannes Reinecke Signed-off-by: Christoph Hellwig --- drivers/scsi/esp_scsi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c index 800ff3ea501d..7ebf2c7d17a4 100644 --- a/drivers/scsi/esp_scsi.c +++ b/drivers/scsi/esp_scsi.c @@ -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; -- 2.39.5