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esp.c: ensure that STAT_INT is cleared when reading ESP_RINTR 

Both esp_raise_irq() and esp_lower_irq() check the STAT_INT bit in ESP_RSTAT
to ensure that the IRQ is raised or lowered if its state changes. When reading
ESP_RINTR, esp_lower_irq() was being called *after* ESP_RSTAT had been
cleared meaning that STAT_INT was already clear, and so if STAT_INT was
asserted beforehand then the esp_lower_irq() would have no effect.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Helge Deller <deller@gmx.de>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20240112125420.514425-71-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2024-01-12 12:54:02 +00:00
parent 0ee71db4fc
commit d294b77a95
1 changed files with 1 additions and 1 deletions
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2
hw/scsi/esp.c
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@ -1127,6 +1127,7 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
*/
val = s->rregs[ESP_RINTR];
s->rregs[ESP_RINTR] = 0;
esp_lower_irq(s);
s->rregs[ESP_RSTAT] &= ~STAT_TC;
/*
* According to the datasheet ESP_RSEQ should be cleared, but as the
@ -1137,7 +1138,6 @@ uint64_t esp_reg_read(ESPState *s, uint32_t saddr)
*
* s->rregs[ESP_RSEQ] = SEQ_0;
*/
esp_lower_irq(s);
break;
case ESP_TCHI:
/* Return the unique id if the value has never been written */