On Fri, Jan 02, 2015 at 09:52:20AM +0530, Punnaiah Choudary Kalluri wrote:
> +/**
> + * synps_edac_handle_error - Handle controller error types CE and UE
> + * @mci: Pointer to the edac memory controller instance
> + * @p: Pointer to the synopsys ecc status structure
> + *
> + * Handles the controller ECC correctable and un correctable error.
> + */
> +static void synps_edac_handle_error(struct mem_ctl_info *mci,
> + struct synps_ecc_status *p)
> +{
> + char message[SYNPS_EDAC_MSG_SIZE];
This is still on the stack. My previous comment:
"You could preallocate this on driver init so you don't do relatively
big stack allocations on the error reporting path and remain lean."
> + struct ecc_error_info *pinf;
> +
> + if (p->ce_cnt) {
> + pinf = &p->ceinfo;
> + snprintf(message, SYNPS_EDAC_MSG_SIZE,
> + "DDR ECC error type :%s Row %d Bank %d Col %d ",
> + "CE", pinf->row, pinf->bank, pinf->col);
> + edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci,
> + p->ce_cnt, 0, 0, 0, 0, 0, -1,
> + message, "");
> + }
> +
> + if (p->ue_cnt) {
> + pinf = &p->ueinfo;
> + snprintf(message, SYNPS_EDAC_MSG_SIZE,
> + "DDR ECC error type :%s Row %d Bank %d Col %d ",
> + "UE", pinf->row, pinf->bank, pinf->col);
> + edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci,
> + p->ue_cnt, 0, 0, 0, 0, 0, -1,
> + message, "");
> + }
>From the previous review:
"If you memset(p, 0,...) here, after consumption, you don't need to do
it anywhere else and be sure that *p would be always clean and ready for
the next error."
Looks like you've missed those two points.
> +static int synps_edac_mc_probe(struct platform_device *pdev)
> +{
> + struct mem_ctl_info *mci;
> + struct edac_mc_layer layers[2];
> + struct synps_edac_priv *priv;
> + int rc;
> + struct resource *res;
> + void __iomem *baseaddr;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + baseaddr = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(baseaddr))
> + return PTR_ERR(baseaddr);
> +
> + if (!synps_edac_get_eccstate(baseaddr)) {
> + edac_printk(KERN_INFO, EDAC_MC, "ECC not enabled\n");
> + return -ENXIO;
> + }
> +
> + layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
> + layers[0].size = SYNPS_EDAC_NR_CSROWS;
> + layers[0].is_virt_csrow = true;
> + layers[1].type = EDAC_MC_LAYER_CHANNEL;
> + layers[1].size = SYNPS_EDAC_NR_CHANS;
> + layers[1].is_virt_csrow = false;
> +
> + mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
> + sizeof(struct synps_edac_priv));
> + if (!mci) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "Failed memory allocation for mc instance\n");
> + return -ENOMEM;
> + }
> +
> + priv = mci->pvt_info;
> + priv->baseaddr = baseaddr;
> + rc = synps_edac_mc_init(mci, pdev);
> + if (rc) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "Failed to initialize instance\n");
> + goto free_edac_mc;
> + }
> +
> + rc = edac_mc_add_mc(mci);
> + if (rc) {
> + edac_printk(KERN_ERR, EDAC_MC,
> + "Failed to register with EDAC core\n");
> + goto free_edac_mc;
> + }
With all the more or less redundant commenting in this driver, the *one*
line which definitely needs a comment is without one:
/*
* Start capturing the correctable and uncorrectable errors. A write of
* 0 starts the counters.
*/
> + writel(0x0, baseaddr + ECC_CTRL_OFST);
> + return rc;
> +
> +free_edac_mc:
> + edac_mc_free(mci);
> +
> + return rc;
> +}
--
Regards/Gruss,
Boris.
Sent from a fat crate under my desk. Formatting is fine.
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