lib: sbi_irqchip: fix MSI EIID gap and tail allocation logic in register_msi

Fix sbi_irqchip_register_msi() that prevented contiguous EIID allocation:

- Gap check condition was inverted: the original `h->first_hwirq -
  hwirq < num_hwirq` incorrectly set `found = true` when the gap was
  too small to fit num_hwirq entries. Correct to `>= num_hwirq` so
  allocation only proceeds when sufficient space exists between
  registered handlers.

- Tail-space check `!found && !hwirq` never triggered after iteration
  Replace with `(chip->num_hwirq - hwirq) >= num_hwirq` to correctly
  allocate if handler list is empty.

Fixes: 79e63bc8348d ("irqchip: add sbi_irqchip_register_msi support")

Signed-off-by: Oza Pawandeep <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/sbi/sbi_irqchip.c b/lib/sbi/sbi_irqchip.c
index d6771fa8..b490a3ad 100644
--- a/lib/sbi/sbi_irqchip.c
+++ b/lib/sbi/sbi_irqchip.c
@@ -392,7 +392,7 @@ int sbi_irqchip_register_msi(struct sbi_irqchip_device *chip, u32 num_hwirq,
 		if (h->first_hwirq <= hwirq && hwirq < (h->first_hwirq + h->num_hwirq)) {
 			hwirq = h->first_hwirq + h->num_hwirq;
 		} else if (hwirq < h->first_hwirq) {
-			if (h->first_hwirq - hwirq < num_hwirq) {
+			if (h->first_hwirq - hwirq >= num_hwirq) {
 				found = true;
 				break;
 			} else {
@@ -400,7 +400,7 @@ int sbi_irqchip_register_msi(struct sbi_irqchip_device *chip, u32 num_hwirq,
 			}
 		}
 	}
-	if (!found && !hwirq)
+	if (!found && (chip->num_hwirq - hwirq) >= num_hwirq)
 		found = true;
 	if (!found)
 		return SBI_ENOSPC;