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| author | Phillip Potter <phil@philpotter.co.uk> | 2021-05-03 13:57:18 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-13 18:32:29 +0200 |
| commit | 4df2a8b0ad634d98a67e540a4e18a60f943e7d9f (patch) | |
| tree | 174dc763f75362eb56e1c320f4cd2936993ca6a6 /drivers/dma | |
| parent | 43ed0fcf613a87dd0221ec72d1ade4d6544f2ffc (diff) | |
| download | linux-4df2a8b0ad634d98a67e540a4e18a60f943e7d9f.tar.gz linux-4df2a8b0ad634d98a67e540a4e18a60f943e7d9f.tar.xz | |
dmaengine: qcom_hidma: comment platform_driver_register call
Place a comment in hidma_mgmt_init explaining why success must
currently be assumed, due to the cleanup issue that would need to
be considered were this module ever to be unloadable or were this
platform_driver_register call ever to fail.
Acked-By: Vinod Koul <vkoul@kernel.org>
Acked-By: Sinan Kaya <okaya@kernel.org>
Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20210503115736.2104747-52-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/qcom/hidma_mgmt.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/dma/qcom/hidma_mgmt.c b/drivers/dma/qcom/hidma_mgmt.c index fe87b01f7a4e..62026607f3f8 100644 --- a/drivers/dma/qcom/hidma_mgmt.c +++ b/drivers/dma/qcom/hidma_mgmt.c @@ -418,6 +418,20 @@ static int __init hidma_mgmt_init(void) hidma_mgmt_of_populate_channels(child); } #endif + /* + * We do not check for return value here, as it is assumed that + * platform_driver_register must not fail. The reason for this is that + * the (potential) hidma_mgmt_of_populate_channels calls above are not + * cleaned up if it does fail, and to do this work is quite + * complicated. In particular, various calls of of_address_to_resource, + * of_irq_to_resource, platform_device_register_full, of_dma_configure, + * and of_msi_configure which then call other functions and so on, must + * be cleaned up - this is not a trivial exercise. + * + * Currently, this module is not intended to be unloaded, and there is + * no module_exit function defined which does the needed cleanup. For + * this reason, we have to assume success here. + */ platform_driver_register(&hidma_mgmt_driver); return 0; |