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Subject: media: siano: Fix coherent memory allocation failure on arm64
Author:  Tomoki Sekiyama <tomoki.sekiy...@gmail.com>
Date:    Sat Mar 3 13:20:56 2018 -0500

On some architectures such as arm64, siano chip based TV-tuner
USB devices are not recognized correctly due to coherent memory
allocation failure with the following error:

[  663.556135] usbcore: deregistering interface driver smsusb
[  683.624809] smsusb:smsusb_probe: board id=18, interface number 0
[  683.633530] smsusb:smsusb_init_device: smscore_register_device(...) failed, 
rc -12
[  683.641501] smsusb:smsusb_probe: Device initialized with return code -12
[  683.652978] smsusb: probe of 1-1:1.0 failed with error -12

This is caused by dma_alloc_coherent(NULL, ...) returning NULL in
smscoreapi.c.

To fix this error, allocate the buffer memory for the USB devices
via kmalloc() and let the USB core do the DMA mapping and free.

Signed-off-by: Tomoki Sekiyama <tomoki.sekiy...@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mche...@s-opensource.com>

 drivers/media/common/siano/smscoreapi.c | 33 ++++++++++++++++++++++-----------
 drivers/media/common/siano/smscoreapi.h |  2 ++
 drivers/media/usb/siano/smsusb.c        |  4 ++--
 3 files changed, 26 insertions(+), 13 deletions(-)

---

diff --git a/drivers/media/common/siano/smscoreapi.c 
b/drivers/media/common/siano/smscoreapi.c
index c5c827e11b64..b5dcc6d1fe90 100644
--- a/drivers/media/common/siano/smscoreapi.c
+++ b/drivers/media/common/siano/smscoreapi.c
@@ -631,7 +631,8 @@ smscore_buffer_t *smscore_createbuffer(u8 *buffer, void 
*common_buffer,
 
        cb->p = buffer;
        cb->offset_in_common = buffer - (u8 *) common_buffer;
-       cb->phys = common_buffer_phys + cb->offset_in_common;
+       if (common_buffer_phys)
+               cb->phys = common_buffer_phys + cb->offset_in_common;
 
        return cb;
 }
@@ -690,17 +691,21 @@ int smscore_register_device(struct smsdevice_params_t 
*params,
 
        /* alloc common buffer */
        dev->common_buffer_size = params->buffer_size * params->num_buffers;
-       dev->common_buffer = dma_alloc_coherent(NULL, dev->common_buffer_size,
-                                               &dev->common_buffer_phys,
-                                               GFP_KERNEL | GFP_DMA);
-       if (!dev->common_buffer) {
+       if (params->usb_device)
+               buffer = kzalloc(dev->common_buffer_size, GFP_KERNEL);
+       else
+               buffer = dma_alloc_coherent(params->device,
+                                           dev->common_buffer_size,
+                                           &dev->common_buffer_phys,
+                                           GFP_KERNEL | GFP_DMA);
+       if (!buffer) {
                smscore_unregister_device(dev);
                return -ENOMEM;
        }
+       dev->common_buffer = buffer;
 
        /* prepare dma buffers */
-       for (buffer = dev->common_buffer;
-            dev->num_buffers < params->num_buffers;
+       for (; dev->num_buffers < params->num_buffers;
             dev->num_buffers++, buffer += params->buffer_size) {
                struct smscore_buffer_t *cb;
 
@@ -720,6 +725,7 @@ int smscore_register_device(struct smsdevice_params_t 
*params,
        dev->board_id = SMS_BOARD_UNKNOWN;
        dev->context = params->context;
        dev->device = params->device;
+       dev->usb_device = params->usb_device;
        dev->setmode_handler = params->setmode_handler;
        dev->detectmode_handler = params->detectmode_handler;
        dev->sendrequest_handler = params->sendrequest_handler;
@@ -1231,10 +1237,15 @@ void smscore_unregister_device(struct smscore_device_t 
*coredev)
 
        pr_debug("freed %d buffers\n", num_buffers);
 
-       if (coredev->common_buffer)
-               dma_free_coherent(NULL, coredev->common_buffer_size,
-                       coredev->common_buffer, coredev->common_buffer_phys);
-
+       if (coredev->common_buffer) {
+               if (coredev->usb_device)
+                       kfree(coredev->common_buffer);
+               else
+                       dma_free_coherent(coredev->device,
+                                         coredev->common_buffer_size,
+                                         coredev->common_buffer,
+                                         coredev->common_buffer_phys);
+       }
        kfree(coredev->fw_buf);
 
        list_del(&coredev->entry);
diff --git a/drivers/media/common/siano/smscoreapi.h 
b/drivers/media/common/siano/smscoreapi.h
index 4cc39e4a8318..134c69f7ea7b 100644
--- a/drivers/media/common/siano/smscoreapi.h
+++ b/drivers/media/common/siano/smscoreapi.h
@@ -134,6 +134,7 @@ struct smscore_buffer_t {
 
 struct smsdevice_params_t {
        struct device   *device;
+       struct usb_device       *usb_device;
 
        int                             buffer_size;
        int                             num_buffers;
@@ -176,6 +177,7 @@ struct smscore_device_t {
 
        void *context;
        struct device *device;
+       struct usb_device *usb_device;
 
        char devpath[32];
        unsigned long device_flags;
diff --git a/drivers/media/usb/siano/smsusb.c b/drivers/media/usb/siano/smsusb.c
index f13e4b01b5a5..6d436e9e454f 100644
--- a/drivers/media/usb/siano/smsusb.c
+++ b/drivers/media/usb/siano/smsusb.c
@@ -179,8 +179,7 @@ static int smsusb_submit_urb(struct smsusb_device_t *dev,
                smsusb_onresponse,
                surb
        );
-       surb->urb.transfer_dma = surb->cb->phys;
-       surb->urb.transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
+       surb->urb.transfer_flags |= URB_FREE_BUFFER;
 
        return usb_submit_urb(&surb->urb, GFP_ATOMIC);
 }
@@ -446,6 +445,7 @@ static int smsusb_init_device(struct usb_interface *intf, 
int board_id)
                dev->in_ep, dev->out_ep);
 
        params.device = &dev->udev->dev;
+       params.usb_device = dev->udev;
        params.buffer_size = dev->buffer_size;
        params.num_buffers = MAX_BUFFERS;
        params.sendrequest_handler = smsusb_sendrequest;

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