Generally, declaring a platform device as a static variable is
a bad idea and can cause all kinds of problems, in particular
with the DMA configuration and lifetime rules.
A specific problem we hit here is from a bug in clang that warns
about certain (otherwise valid) macros when used in static variables:
drivers/misc/mic/card/mic_x100.c:285:27: warning: shift count >= width of type
[-Wshift-count-overflow]
static u64 mic_dma_mask = DMA_BIT_MASK(64);
^~~~~~~~~~~~~~~~
include/linux/dma-mapping.h:141:54: note: expanded from macro 'DMA_BIT_MASK'
#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : ((1ULL<<(n))-1))
^ ~~~
A slightly better way here is to create the platform device from
a platform_device_info. This avoids the warning and some other problems,
but is still not ideal because the device creation should really be
separated from the driver.
Fixes: dd8d8d44df64 ("misc: mic: MIC card driver specific changes to enable
SCIF")
Signed-off-by: Arnd Bergmann <[email protected]>
---
drivers/misc/mic/card/mic_x100.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)
diff --git a/drivers/misc/mic/card/mic_x100.c b/drivers/misc/mic/card/mic_x100.c
index 266ffb6f6c44..a5821166f943 100644
--- a/drivers/misc/mic/card/mic_x100.c
+++ b/drivers/misc/mic/card/mic_x100.c
@@ -282,18 +282,6 @@ static void mic_platform_shutdown(struct platform_device
*pdev)
mic_remove(pdev);
}
-static u64 mic_dma_mask = DMA_BIT_MASK(64);
-
-static struct platform_device mic_platform_dev = {
- .name = mic_driver_name,
- .id = 0,
- .num_resources = 0,
- .dev = {
- .dma_mask = &mic_dma_mask,
- .coherent_dma_mask = DMA_BIT_MASK(64),
- },
-};
-
static struct platform_driver __refdata mic_platform_driver = {
.probe = mic_probe,
.remove = mic_remove,
@@ -307,6 +295,12 @@ static int __init mic_init(void)
{
int ret;
struct cpuinfo_x86 *c = &cpu_data(0);
+ struct platform_device_info mic_platform_info = {
+ .name = mic_driver_name,
+ .dma_mask = DMA_BIT_MASK(64),
+ };
+ struct platform_device *pdev;
+
if (!(c->x86 == 11 && c->x86_model == 1)) {
ret = -ENODEV;
@@ -316,9 +310,11 @@ static int __init mic_init(void)
request_module("mic_x100_dma");
mic_init_card_debugfs();
- ret = platform_device_register(&mic_platform_dev);
+
+ pdev = platform_device_register_full(&mic_platform_info);
+ ret = PTR_ERR_OR_ZERO(pdev);
if (ret) {
- pr_err("platform_device_register ret %d\n", ret);
+ pr_err("platform_device_register_full ret %d\n", ret);
goto cleanup_debugfs;
}
ret = platform_driver_register(&mic_platform_driver);
--
2.20.0
