linux-kernel - [PATCH 3/3] uio_mf624: Align memory regions to page size

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Date:   Tue,  7 Mar 2017 15:09:48 +0100
From:   Michal Sojka <sojkam1@....cvut.cz>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Cc:     lisovy@...il.com, Michal Sojka <sojkam1@....cvut.cz>
Subject: [PATCH 3/3] uio_mf624: Align memory regions to page size

Without that, one cannot mmap() the registers to user-space, at least since
commit b65502879556 ("uio: we cannot mmap unaligned page contents").

Tested with real mf624 card.

Signed-off-by: Michal Sojka <sojkam1@....cvut.cz>
---
 drivers/uio/uio_mf624.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio_mf624.c b/drivers/uio/uio_mf624.c
index 8f30fa1af2ab..35187c052e8c 100644
--- a/drivers/uio/uio_mf624.c
+++ b/drivers/uio/uio_mf624.c
@@ -129,11 +129,15 @@ static int mf624_irqcontrol(struct uio_info *info, s32 irq_on)
 
 static int mf624_setup_mem(struct pci_dev *dev, int bar, struct uio_mem *mem, const char *name)
 {
+	resource_size_t start = pci_resource_start(dev, bar);
+	resource_size_t len = pci_resource_len(dev, bar);
+
 	mem->name = name;
-	mem->addr = pci_resource_start(dev, bar);
+	mem->addr = start & PAGE_MASK;
+	mem->offs = start & ~PAGE_MASK;
 	if (!mem->addr)
 		return -ENODEV;
-	mem->size = pci_resource_len(dev, bar);
+	mem->size = ((start & ~PAGE_MASK) + len + PAGE_SIZE - 1) & PAGE_MASK;
 	mem->memtype = UIO_MEM_PHYS;
 	mem->internal_addr = pci_ioremap_bar(dev, bar);
 	if (!mem->internal_addr)
-- 
2.11.0