ACPI: pfr_update: Fix return value check in pfru_write()

In case of error, memremap() returns NULL pointer not
ERR_PTR(). The IS_ERR() test in the return value check
should be replaced with NULL test.

Fixes: 0db89fa243e5 ("ACPI: Introduce Platform Firmware Runtime Update device driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Chen Yu <yu.c.chen@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/pfr_update.c b/drivers/acpi/pfr_update.c
index 149b5b2..6bb0b77 100644 (file)
--- a/drivers/acpi/pfr_update.c
+++ b/drivers/acpi/pfr_update.c
@@ -460,8 +460,8 @@ static ssize_t pfru_write(struct file *file, const char __user *buf,
        /* map the communication buffer */
        phy_addr = (phys_addr_t)((buf_info.addr_hi << 32) | buf_info.addr_lo);
        buf_ptr = memremap(phy_addr, buf_info.buf_size, MEMREMAP_WB);
-       if (IS_ERR(buf_ptr))
-               return PTR_ERR(buf_ptr);
+       if (!buf_ptr)
+               return -ENOMEM;
 
        if (!copy_from_iter_full(buf_ptr, len, &iter)) {
                ret = -EINVAL;