linux-kernel - [PATCH 3/3] uio_pdrv_genirq: Allow use with non-page-aligned memory resources

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Date:   Wed,  1 Jul 2020 16:56:59 +0200
From:   Esben Haabendal <esben@...nix.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 3/3] uio_pdrv_genirq: Allow use with non-page-aligned memory resources

Similar to the changes made in 270579d95f82 ("uio_mf624: Align memory
regions to page size and set correct offsets"), this will allow
uio_pdrv_genirq devices to expose memory regions that is not page-aligned,
requiring the users to respect the offset sysfs attribute (as implemented
in libuio).

Signed-off-by: Esben Haabendal <esben@...nix.com>
---
 drivers/uio/uio_pdrv_genirq.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/uio_pdrv_genirq.c b/drivers/uio/uio_pdrv_genirq.c
index b60173bc93ce..86f75a4fe0e3 100644
--- a/drivers/uio/uio_pdrv_genirq.c
+++ b/drivers/uio/uio_pdrv_genirq.c
@@ -187,8 +187,10 @@ static int uio_pdrv_genirq_probe(struct platform_device *pdev)
 		}
 
 		uiomem->memtype = UIO_MEM_PHYS;
-		uiomem->addr = r->start;
-		uiomem->size = resource_size(r);
+		uiomem->addr = r->start & PAGE_MASK;
+		uiomem->offs = r->start & ~PAGE_MASK;
+		uiomem->size = (uiomem->offs + resource_size(r)
+				+ PAGE_SIZE - 1) & PAGE_MASK;
 		uiomem->name = r->name;
 		++uiomem;
 	}
-- 
2.4.11