linux-kernel - [PATCH AUTOSEL 4.19 028/128] EDAC/altera: Use the proper type for the IRQ status bits

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Message-Id: <20190922185418.2158-28-sashal@kernel.org>
Date:   Sun, 22 Sep 2019 14:52:38 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Dan Carpenter <dan.carpenter@...cle.com>,
        Borislav Petkov <bp@...e.de>,
        Thor Thayer <thor.thayer@...ux.intel.com>,
        James Morse <james.morse@....com>,
        kernel-janitors@...r.kernel.org,
        linux-edac <linux-edac@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.19 028/128] EDAC/altera: Use the proper type for the IRQ status bits

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 8faa1cf6ed82f33009f63986c3776cc48af1b7b2 ]

Smatch complains about the cast of a u32 pointer to unsigned long:

  drivers/edac/altera_edac.c:1878 altr_edac_a10_irq_handler()
  warn: passing casted pointer '&irq_status' to 'find_first_bit()'

This code wouldn't work on a 64 bit big endian system because it would
read past the end of &irq_status.

 [ bp: massage. ]

Fixes: 13ab8448d2c9 ("EDAC, altera: Add ECC Manager IRQ controller support")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Reviewed-by: Thor Thayer <thor.thayer@...ux.intel.com>
Cc: James Morse <james.morse@....com>
Cc: kernel-janitors@...r.kernel.org
Cc: linux-edac <linux-edac@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: Tony Luck <tony.luck@...el.com>
Link: https://lkml.kernel.org/r/20190624134717.GA1754@mwanda
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/edac/altera_edac.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/edac/altera_edac.c b/drivers/edac/altera_edac.c
index 5762c3c383f2e..56de378ad13dc 100644
--- a/drivers/edac/altera_edac.c
+++ b/drivers/edac/altera_edac.c
@@ -1956,6 +1956,7 @@ static void altr_edac_a10_irq_handler(struct irq_desc *desc)
 	struct altr_arria10_edac *edac = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	int irq = irq_desc_get_irq(desc);
+	unsigned long bits;
 
 	dberr = (irq == edac->db_irq) ? 1 : 0;
 	sm_offset = dberr ? A10_SYSMGR_ECC_INTSTAT_DERR_OFST :
@@ -1965,7 +1966,8 @@ static void altr_edac_a10_irq_handler(struct irq_desc *desc)
 
 	regmap_read(edac->ecc_mgr_map, sm_offset, &irq_status);
 
-	for_each_set_bit(bit, (unsigned long *)&irq_status, 32) {
+	bits = irq_status;
+	for_each_set_bit(bit, &bits, 32) {
 		irq = irq_linear_revmap(edac->domain, dberr * 32 + bit);
 		if (irq)
 			generic_handle_irq(irq);
-- 
2.20.1