In case of dma_alloc_coherent failing the current code just called
BUG_ON. By adding error handling for that case this can be avoided.
This also fixes a memory leek in case of a fail later on in the probe
function.
Signed-off-by: Christian Lütke-Stetzkamp <christian@xxxxxxxx>
---
drivers/staging/mt7621-mmc/sd.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/staging/mt7621-mmc/sd.c b/drivers/staging/mt7621-mmc/sd.c
index 9cc8f4c8ef28..0d4877483e54 100644
--- a/drivers/staging/mt7621-mmc/sd.c
+++ b/drivers/staging/mt7621-mmc/sd.c
@@ -2787,7 +2787,10 @@ static int msdc_drv_probe(struct platform_device *pdev)
/* using dma_alloc_coherent*/ /* todo: using 1, for all 4 slots */
host->dma.gpd = dma_alloc_coherent(NULL, MAX_GPD_NUM * sizeof(struct gpt), &host->dma.gpd_addr, GFP_KERNEL);
host->dma.bd = dma_alloc_coherent(NULL, MAX_BD_NUM * sizeof(struct bd), &host->dma.bd_addr, GFP_KERNEL);
- BUG_ON((!host->dma.gpd) || (!host->dma.bd));
+ if (!host->dma.gdp || !host->dma.bd) {
+ ret = -ENOMEM;
+ goto release_mem;
+ }
msdc_init_gpd_bd(host, &host->dma);
/*for emmc*/
msdc_6575_host[pdev->id] = host;
@@ -2855,6 +2858,13 @@ static int msdc_drv_probe(struct platform_device *pdev)
cancel_delayed_work_sync(&host->card_delaywork);
#endif
+release_mem:
+ if (host->dma.gpd)
+ dma_free_coherent(NULL, MAX_GPD_NUM * sizeof(struct gpt),
+ host->dma.gpd, host->dma.gpd_addr);
+ if (host->dma.bd)
+ dma_free_coherent(NULL, MAX_BD_NUM * sizeof(struct bd),
+ host->dma.bd, host->dma.bd_addr);
host_free:
mmc_free_host(mmc);
--
2.16.1
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