Re: [PATCH AUTOSEL 5.1 17/59] fpga: dfl: expand minor range when registering chrdev region

From: Sasha Levin
Date: Sun Jun 23 2019 - 15:27:01 EST


On Sat, Jun 15, 2019 at 07:48:06AM +0200, Greg Kroah-Hartman wrote:
On Fri, Jun 14, 2019 at 04:28:01PM -0400, Sasha Levin wrote:
From: Chengguang Xu <cgxu519@xxxxxxx>

[ Upstream commit de9a7f6f5f1967d275311cca9163b4a3ffe9b0ae ]

Actually, total amount of available minor number
for a single major is MINORMASK + 1. So expand
minor range when registering chrdev region.

Signed-off-by: Chengguang Xu <cgxu519@xxxxxxx>
Acked-by: Wu Hao <hao.wu@xxxxxxxxx>
Acked-by: Alan Tull <atull@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/fpga/dfl.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/fpga/dfl.c b/drivers/fpga/dfl.c
index c25217cde5ca..4b66aaa32b5a 100644
--- a/drivers/fpga/dfl.c
+++ b/drivers/fpga/dfl.c
@@ -322,7 +322,7 @@ static void dfl_chardev_uinit(void)
for (i = 0; i < DFL_FPGA_DEVT_MAX; i++)
if (MAJOR(dfl_chrdevs[i].devt)) {
unregister_chrdev_region(dfl_chrdevs[i].devt,
- MINORMASK);
+ MINORMASK + 1);
dfl_chrdevs[i].devt = MKDEV(0, 0);
}
}
@@ -332,8 +332,8 @@ static int dfl_chardev_init(void)
int i, ret;

for (i = 0; i < DFL_FPGA_DEVT_MAX; i++) {
- ret = alloc_chrdev_region(&dfl_chrdevs[i].devt, 0, MINORMASK,
- dfl_chrdevs[i].name);
+ ret = alloc_chrdev_region(&dfl_chrdevs[i].devt, 0,
+ MINORMASK + 1, dfl_chrdevs[i].name);
if (ret)
goto exit;
}

Not a bugfix, so not needed for stable kernels, thanks.

Dropped, thanks!

--
Thanks,
Sasha