Re: [PATCH] ahci_xgene: Fix the error print invalid resource for APM X-Gene SoC AHCI SATA Host Controller driver.

[Russell King - ARM Linux <linux-lFZ/pmaqli7XmaaqVzeoHQ@public.gmane.org>]

On Mon, Sep 15, 2014 at 04:44:52PM +0900, Tejun Heo wrote:
> On Mon, Sep 15, 2014 at 01:10:01PM +0530, Suman Tripathi wrote:
> > [suman] : So the posted version is acceptable ? Any others comments on this
> > patch ?
> 
> I'm suggesting setting ctx->cs_mux to NULL on failure.  IOW,
> 
> 	if (res) {
> 		ctx->csr_mux = devm_ioremap_resources();
> 		if (IS_ERR(ctx->csr_mux)) {
> 			print warning or something;
> 			ctx->csr_mux = NULL;
> 		}
> 	}

A much better approach is:

	if (res) {
		void __iomem *csr = devm_ioremap_resources();
		if (IS_ERR(csr)) {
			ret = ERR_PTR(csr);
			dev_xxx();
			goto err;
		}

		ctx->csr_mux = csr;
	}

Then you never end up in the situation where csr_mux contains an error
pointer value - and is much more obvious that is the case.

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