linux-kernel - [PATCH 1/3] pcmcia: m32r_pcc: check return from request

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Date:   Sun, 18 Sep 2016 23:21:42 +0100
From:   Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, linux-pcmcia@...ts.infradead.org,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH 1/3] pcmcia: m32r_pcc: check return from request_irq

While building m32r allmodconfig we were getting warning:

drivers/pcmcia/m32r_pcc.c:331:2:
 warning: ignoring return value of 'request_irq',
 declared with attribute warn_unused_result

request_irq() can fail and we should always be checking the result from
it. Check the result and return it to the caller.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@...ethink.co.uk>
---

m32r allmodconfig build log is at:
https://travis-ci.org/sudipm-mukherjee/parport/jobs/160355863

 drivers/pcmcia/m32r_pcc.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/drivers/pcmcia/m32r_pcc.c b/drivers/pcmcia/m32r_pcc.c
index eb126b9..fad4455 100644
--- a/drivers/pcmcia/m32r_pcc.c
+++ b/drivers/pcmcia/m32r_pcc.c
@@ -296,10 +296,11 @@ static int __init is_alive(u_short sock)
 	return 0;
 }
 
-static void add_pcc_socket(ulong base, int irq, ulong mapaddr,
-			   unsigned int ioaddr)
+static int add_pcc_socket(ulong base, int irq, ulong mapaddr,
+			  unsigned int ioaddr)
 {
   	pcc_socket_t *t = &socket[pcc_sockets];
+	int err;
 
 	/* add sockets */
 	t->ioaddr = ioaddr;
@@ -328,11 +329,16 @@ static void add_pcc_socket(ulong base, int irq, ulong mapaddr,
 	t->socket.irq_mask = 0;
 	t->socket.pci_irq = 2 + pcc_sockets; /* XXX */
 
-	request_irq(irq, pcc_interrupt, 0, "m32r-pcc", pcc_interrupt);
+	err = request_irq(irq, pcc_interrupt, 0, "m32r-pcc", pcc_interrupt);
+	if (err) {
+		if (t->base > 0)
+			release_region(t->base, 0x20);
+		return err;
+	}
 
 	pcc_sockets++;
 
-	return;
+	return 0;
 }
 
 
-- 
1.9.1