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authorHannes Reinecke <hare@suse.de>2014-11-24 17:37:23 +0300
committerChristoph Hellwig <hch@lst.de>2014-11-24 18:10:24 +0300
commit9535fff3c5f9382b46f656c46a80bc190645dd32 (patch)
tree958780776ed5f164ad854d9fc7daf38b934fe6b9 /drivers/scsi/esp_scsi.c
parent1af6f60368b3f5be6a89350ccd23e218120fd3d1 (diff)
downloadlinux-9535fff3c5f9382b46f656c46a80bc190645dd32.tar.xz
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>
Diffstat (limited to 'drivers/scsi/esp_scsi.c')
-rw-r--r--drivers/scsi/esp_scsi.c8
1 files 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;