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Message-ID: <20200527012628.1100649-4-jhubbard@nvidia.com>
Date: Tue, 26 May 2020 18:26:28 -0700
From: John Hubbard <jhubbard@...dia.com>
To: LKML <linux-kernel@...r.kernel.org>
CC: Souptick Joarder <jrdr.linux@...il.com>,
John Hubbard <jhubbard@...dia.com>,
Derek Kiernan <derek.kiernan@...inx.com>,
Dragan Cvetic <dragan.cvetic@...inx.com>,
Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Michal Simek <michal.simek@...inx.com>,
<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 3/3] misc: xilinx-sdfec: convert get_user_pages() --> pin_user_pages()
This code was using get_user_pages*(), in approximately a "Case 1"
scenario (Direct IO), using the categorization from [1]. That means
that it's time to convert the get_user_pages*() + put_page() calls to
pin_user_pages*() + unpin_user_pages() calls.
There is some helpful background in [2]: basically, this is a small
part of fixing a long-standing disconnect between pinning pages, and
file systems' use of those pages.
[1] Documentation/core-api/pin_user_pages.rst
[2] "Explicit pinning of user-space pages":
https://lwn.net/Articles/807108/
Cc: Derek Kiernan <derek.kiernan@...inx.com>
Cc: Dragan Cvetic <dragan.cvetic@...inx.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Michal Simek <michal.simek@...inx.com>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---
drivers/misc/xilinx_sdfec.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/misc/xilinx_sdfec.c b/drivers/misc/xilinx_sdfec.c
index 7e2ee3e547f2..cda3559025d5 100644
--- a/drivers/misc/xilinx_sdfec.c
+++ b/drivers/misc/xilinx_sdfec.c
@@ -627,12 +627,11 @@ static int xsdfec_table_write(struct xsdfec_dev *xsdfec, u32 offset,
nr_pages = n;
- res = get_user_pages_fast((unsigned long)src_ptr, nr_pages, 0, pages);
+ res = pin_user_pages_fast((unsigned long)src_ptr, nr_pages, 0, pages);
if (res < nr_pages) {
- if (res > 0) {
- for (i = 0; i < res; i++)
- put_page(pages[i]);
- }
+ if (res > 0)
+ unpin_user_pages(pages, res);
+
return -EINVAL;
}
@@ -646,7 +645,7 @@ static int xsdfec_table_write(struct xsdfec_dev *xsdfec, u32 offset,
reg++;
} while ((reg < len) &&
((reg * XSDFEC_REG_WIDTH_JUMP) % PAGE_SIZE));
- put_page(pages[i]);
+ unpin_user_page(pages[i]);
}
return 0;
}
--
2.26.2
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