From: Chengguang Xu cgxu519@gmx.com
[ 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@gmx.com Acked-by: Wu Hao hao.wu@intel.com Acked-by: Alan Tull atull@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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; }