linux-kernel - [PATCH v2 3/6] staging: fbtft: fallback to usual allocation when DMA fails

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Message-Id: <20170102113534.127692-4-andriy.shevchenko@linux.intel.com>
Date:   Mon,  2 Jan 2017 13:35:31 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Noralf Trønnes <noralf@...nnes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        linux-kernel@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 3/6] staging: fbtft: fallback to usual allocation when DMA fails

Fall back to usual allocation method if DMA coherent allocation fails.

SPI framework will map and use DMA mapped memory when possible.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/staging/fbtft/fbtft-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/fbtft/fbtft-core.c b/drivers/staging/fbtft/fbtft-core.c
index 226be8c09768..9f024986aff4 100644
--- a/drivers/staging/fbtft/fbtft-core.c
+++ b/drivers/staging/fbtft/fbtft-core.c
@@ -843,7 +843,8 @@ struct fb_info *fbtft_framebuffer_alloc(struct fbtft_display *display,
 		if (dma) {
 			txbuf = dmam_alloc_coherent(dev, txbuflen,
 						    &par->txbuf.dma, GFP_DMA);
-		} else
+		}
+		if (!txbuf)
 #endif
 		{
 			txbuf = devm_kzalloc(par->info->device,
-- 
2.11.0