[PATCH] gpib: cb7210: Fix region leak when request_irq fails

[Hongling Zeng]

When request_irq() fails, the region allocated by request_region()
is not released. Fix this by calling release_region() before returning.

  Smatch warning:
    drivers/gpib/cb7210/cb7210.c:1068 cb_isa_attach() warn: 'config->ibbase'
  from __request_region() not released on lines: 1064.

Fixes: 82e3508046f9b ("gpib: cb7210: add isa support module")
Signed-off-by: Hongling Zeng <zenghongling@xxxxxxxxxx>
---
 drivers/gpib/cb7210/cb7210.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpib/cb7210/cb7210.c b/drivers/gpib/cb7210/cb7210.c
index 6dd8637c5964..05058bf2cd50 100644
--- a/drivers/gpib/cb7210/cb7210.c
+++ b/drivers/gpib/cb7210/cb7210.c
@@ -1062,6 +1062,7 @@ static int cb_isa_attach(struct gpib_board *board, const struct gpib_board_confi
 	// install interrupt handler
 	if (request_irq(config->ibirq, cb7210_interrupt, isr_flags, DRV_NAME, board)) {
 		dev_err(board->gpib_dev, "failed to obtain IRQ %d\n", config->ibirq);
+		release_region(nec7210_iobase(cb_priv), cb7210_iosize);
 		return -EBUSY;
 	}
 	cb_priv->irq = config->ibirq;
-- 
2.25.1